Sign in with
Sign up | Sign in
Your question

Is my 450w Psu good enough for AMD 6770?

Last response: in Graphics & Displays
Share
December 11, 2011 7:26:48 AM

So i have a 450w psu with 26 amps ( 2 +12v rails ) and i am thinking of buying the 6770. Right now i have a 5550 and its just not enough for skyrim. I also have a Dual core OC to 3,4Ghz and 4 gb of ram, 750gb harddisk. So would you guys recommend i buy it? Is my psu enoug?

Any feedback appreciated,
Thanks.

More about : 450w psu good amd 6770

December 11, 2011 7:44:57 AM

what is the brand of you PSU. just for reference i run a corsair cx500 which is a 500 watt supply with a 4.5 ghz overclocked 2600k with an overclocked 6950 with no problems
December 11, 2011 7:52:41 AM

It's a CodeGen...i know it isnt a top of the line psu brand but is 26 Amps enough for the card? Ive seen people get the card to work with a similar psu but i just want to be sure before i put my money into it.
Related resources
December 11, 2011 8:34:57 AM

Thanks! I just came back from a local pc store and they said that a molex to 6pin comes with the gpu so in case i dont have a 6 pin connector i can just use the one that comes with the card instead. Also do you think my intel dual core e5400 oc @ 3,4ghz isnt a very big of a bottleneck to the 6770?

Thanks.
a b À AMD
December 11, 2011 9:05:58 AM

I'll give my standard answer of don't do it. If you have a no name PSU that has the little red voltage select switch and lacks a PCIe plug, don't try to power a card that needs one. Sure it might work for awhile, but you will stress that PSU and who knows what could happen. Just buy a new PSU and remove the worry. Why risk your computer?
December 11, 2011 9:20:11 AM

Okay, i'll think about it... Even if i do buy the card, i'm sure i would buy a new psu in a month because right now i just can't afford both . However if the card won't work at all, then i will put my old card back in and just wait a bit until i can buy a new psu (Probably in the beginning/mid January).

Thanks anyways.
a b À AMD
December 11, 2011 9:53:03 AM

It will probably work. The issue is the stress you'll put the PSU under by making it work in conditions it can't handle.

If you have $$$ now, I'd actually get the PSU. That way you won't forget to upgrade it later.
December 11, 2011 10:28:04 AM

Yea, i understand. I actually think that if i can't buy both atm, i'm gonna buy the Psu then first, because i have read people having bad experience with their Psu's when they fail.

So, i was wondering should i buy a Corsair 650w Psu for future upgrades also, or should i stick with a Corsair 500-550 watt? Because my current Cpu is Intel dual core e5400 OC to 3,4ghz and my mobo has a LGA 775 socket, so the best Cpu i can ever buy is the C2Q series...and those are expensive and hard to get these days so i'm not sure if it's worth it.

If i Would stay with my current cpu, would any future upgrades be pointless, because it might be too big of a bottleneck? I was thinking of maybe even going for the radeon 6850/70 after i get a new Psu but i'm not sure if it's worth it considering my current cpu is a dual core. What do you think?

Thanks.
a b À AMD
December 11, 2011 10:54:56 AM

What GPU(s) will you be running? If you are likely to stick with a single card in the mid range at best, then a quality 500W unit will be fine. If you might be running CF/SLI, then you'll need PCIe plugs and 650-750W at least. Decide what GPU(s) you'll be running or likely to run and then buy your PSU based on that.
December 11, 2011 11:21:30 AM

I was thinking of going with the Amd radeon 6770, but before i buy a new psu i'm gonna google for the rest of the day and see if my current 26 amp 450w psu isnt enough... If i buy the 6770 now i could buy a good brand psu in the beginning of january. Do you think i would last that far?
December 11, 2011 11:41:42 AM

It is fine. Don't worry.
December 11, 2011 12:01:18 PM

I hope so because i really want more fps in my games.... Saints row 3 runs at ~20 fps which is unplayable... Mw3 however runs smooth at 60 fps. So u refillable would say that my current psu can handle the 6770?
December 11, 2011 2:53:35 PM

So anyone else recommending i'd do it also? I just want to be sure :) 
December 11, 2011 3:09:53 PM

By these specs I found here, I'd say don't do it!
I'm guessing at your PSU since we don't have more details on it, but I'm betting it's under powered and the wattage is overrated. I'm betting it's only like a 250w PSU at best (12v x 16a = 192w on the 12v rail). I would be very weary of even hooking it up, if my fears are right on this one.


Features/Specifications:
Codegen 450W 20 + 4-pin ATX Switching Power Supply

General Features:
Large, Ultra Quiet Cooling Fan
Output: 450 Watt
Voltage: 115V/230V
Current: 10A/5A
Frequency: 50 ~ 60 Hz
One (1) 20+4 pin ATX power connector
Three (3) large Molex 4-pin power connectors
One (1) 4-pin Floppy connector
One (1) 4-pin 12V Power Connector
One (1) SATA connector

Specifications:
+3.3V / 20A
+5V / 25A
+12V / 16A
+5VSB / 2A
-5V / 0.5A
-12V / 0.8A

I'd say at least upgrade to this 400w PSU listed below:
Antec NEO ECO 400C 400W Continuous Power ATX12V 2.3 / EPS12V 80 PLUS Certified Active PFC Power Supply
Just for comparison sakes, it comes w/30A on the 12v rail (12v rail used mainly for GPU power). If you have future ideas of upgrading above an AMD 6850 GPU, than I'd suggest getting at least 500w or better QUALITY PSU (Antec/Corsair/Seasonic/PCP&C generally are quality PSU's).
December 11, 2011 3:29:47 PM

My psu has 14 amps and 12 amps combined on the 12v rail = 26 amps, so would that work?
December 11, 2011 4:21:15 PM

CryArctic said:
Thanks! I just came back from a local pc store and they said that a molex to 6pin comes with the gpu so in case i dont have a 6 pin connector i can just use the one that comes with the card instead. Also do you think my intel dual core e5400 oc @ 3,4ghz isnt a very big of a bottleneck to the 6770?

Thanks.


thats a different situation. if you dont have the recommended conector then just fork over the 60 bucks for a new PSu
December 11, 2011 4:35:06 PM

I'm not sure if i have it or not. But amp wise would my psu be enough? 26 amps
December 11, 2011 4:51:21 PM

I've had that cpu (kinda=e5300) and a 5770 and the higher I overclocked the more frames I was able to put out. I had my e5300 at 4.0ghz and I saw gains all the way from 3ghz to 4ghz
December 11, 2011 4:58:22 PM

Im not planning to OC my cpu any further because then it will get real hot and i dont wanna risk it. But i'm talkin about 6770's compatibility with my psu here :-)
December 11, 2011 5:06:13 PM

no dont risk it

the psu i mean
December 11, 2011 5:16:47 PM

Hmm okay. But do you think if i would buy the card now and buy the psu in ~15 days, could my current psu handle the card for that time? Some people here at local stores say that it could handle it, some say that they cant guarantee. Ive read that the 6770 really isnt a powerhungry card. And 26 amps is like 312 watts, ive seen here on tomshardware that a high end system with a 5770 uses 262 watts
December 11, 2011 5:39:11 PM

CryArctic said:
So i have a 450w psu with 26 amps ( 2 +12v rails ) and i am thinking of buying the 6770. Right now i have a 5550 and its just not enough for skyrim. I also have a Dual core OC to 3,4Ghz and 4 gb of ram, 750gb harddisk. So would you guys recommend i buy it? Is my psu enoug?

Any feedback appreciated,
Thanks.



You have most likely been living on borrowed time for at least a couple years. It's time to pony up and get a PSU that will meet all your needs under all conditions, not one that's just barely big enough.
December 11, 2011 5:49:01 PM

I got this pc in the beginning of 2011. All im asking is if thos psu would last me a few weeks with the 6770 before i get a new psu
December 11, 2011 5:51:36 PM

CryArctic said:
Hmm okay. But do you think if i would buy the card now and buy the psu in ~15 days, could my current psu handle the card for that time? Some people here at local stores say that it could handle it, some say that they cant guarantee. Ive read that the 6770 really isnt a powerhungry card. And 26 amps is like 312 watts, ive seen here on tomshardware that a high end system with a 5770 uses 262 watts


I can tell that you definitely want to try the 6770 with your current PSU. That is totally up to you and I think most will agree that it will probably work (at least for a little while). Changing PSUs is a pain anyway. Your options are simple: 1) If you care about the longevity of your system, get a new well-branded PSU. Maybe even get one to carry with you into your next system. 2) If you aren't going to curl up and die if your old inexpensive PSU blows up your system with its new graphics card, then you might be able to get by without a PSU upgrade. But make sure your data is backed up and that you have plenty of fire suppression equipment, dying PSUs are unpredictable!
December 11, 2011 6:14:07 PM

Yea the maximum time im keeping this psu if i get the 6770 is like 2-3 weeks, then i will definetly change psus. I'm not sure if its worth buying a high wattage good brand psu for me because the best processor i can have is the core2quad series....i think my current dual core is just too big of a bottleneck for more powerful cards than the 6770 don't you think?
a b À AMD
December 11, 2011 6:16:22 PM

Quote:
My psu has 14 amps and 12 amps combined on the 12v rail = 26 amps


It doesn't work like that, you can't just add the numbers together.
December 11, 2011 6:20:45 PM

4745454b said:
Quote:
My psu has 14 amps and 12 amps combined on the 12v rail = 26 amps


It doesn't work like that, you can't just add the numbers together.



Im not so sure, it looks like he did add them together ;) 
December 11, 2011 6:33:43 PM

Then how many amps do i have if i got 14 on one rail and 12 on another? How does it work?
December 11, 2011 8:40:52 PM

CryArctic said:
Then how many amps do i have if i got 14 on one rail and 12 on another? How does it work?


if your not going to take advice then dont ask for it. amd recommends 450 watt psu and the psu you have is prolly not a name brand. none name brand psu are notorious for not putting out what they are rated to. buy a new psu at the same time you get your gpu. if you going to do something do it right the first time and just get what you need at once.
a b À AMD
December 11, 2011 9:07:57 PM

CryArctic said:
Then how many amps do i have if i got 14 on one rail and 12 on another? How does it work?

There should be a listing of the combined 12 volt current or wattage on the label. Many power supplies adding does not work(not saying some do not, my Antec EA380 was labeled just like that).

If you have a camera, a picture of the label never hurts.

Here is an example

from bit tech. As you can see there are 4 x 20 amps rails(each rail can give out 20A as long as the total on all rails never passes 45A or 540 watts[So after 2 rails are maxed, there is only 5 amps left to share on the others]. Also note, that if 5 and 3.3 voltage was in use the overall 12 volt amperage would have to drop as well since the other voltages on this unit are fed from the main 12 volt rail)


Hope that clears it up a bit.

As lunyone pointed out, a Google for that power supply suggests a 16 amp rail(only 1) for 12 volts, that is not going to cut it. If you have that unit, do not risk it.
December 11, 2011 11:04:10 PM

It's possible to run the 6770 GPU with that PSU, but at what cost? It's up to you on what you want to do, since several people said not to do it, but your still wanting to try it. I can tell you that if your PSU is over-worked than you can possibly damage other parts of your system, without you know it right away. It can best be explained that it's like playing Russian Roulette with your system. Most of the time it might be okay and than "BAM!" something goes wrong.

To the previous poster stating that a PSU changeout is a pain, he's partially correct, but running a PSU into the ground isn't going to be fun either. Either take experienced PC builders suggestions or don't. It's all up to you. You asked for suggestions and advice, so either take it or leave it. I know I wouldn't do what you want to do, but that is just me (an experienced PC builder). Now I haven't built more than 30 or so PC builds, but I've seen what can happen when you try and run a system on the edge with a marginal PSU.
December 12, 2011 2:45:34 AM

Don't get me wrong, I do take your advice and hearing that most people don't recommend it, i wont do it. And if i buy a new psu, i'm gonna let the people at the pc store install it for me. And yea i'm going to buy both now together probably.
a b À AMD
December 12, 2011 3:19:10 AM

Look at the pic that nuke posted. Do you see the graph? Can you read the lines under the graph? There is a line there they says "12v1 + 12v2 + 12v3 + 12v4 load not to exceed 45A." That PSU can output a total of 45A on its 12V rail. If it said not to exceed 540W, then just divide the 540W by 12V to get the same 45A figure.

The issue you'll find with low end PSUs is that they won't give you this information. And there really isn't a way for a user to know unless its provided.
December 12, 2011 3:43:20 AM

I will look at my psu when i get home ( in ~6 hours ) and will give u the info
December 12, 2011 9:24:10 AM

Changing out the PSU isn't really that bad. All you do is unplug the Mobo 20 or 24pin power connection, CPU power connection (on the mobo), all DVD/HD power connectors (usually just SATA power), and any direct fan connections. Than you unscrew the 4 screws in the back of the case that hold the PSU into the case and than you pull it out and replace with new PSU. Re-connect all of your power connections and voila! your new PSU is installed!
a b À AMD
December 12, 2011 10:04:35 AM

I would agree. Chaning a heatsink or motherboard is way worse.
December 12, 2011 11:26:21 AM




So this is my psu....yeah i quess there is no Max Amperage written here. Kinda shopping for a psu already :) 
December 12, 2011 12:21:42 PM

Here's a few Antec PSU's to consider.

$48 shipped! 30A on the 12v rail! Good for Mid/Low level GPU's (probably up to 6850 GPU)
400w - 1 x 6 pin PCI-e power connector

$58 shipped! 40A on the 12v rail. Should be able to handle just about any single GPU out there!
520w - 1 x 6 pin & 1 x 6+2 pin (8 pin) PCI-e power connectors.

$73 shipped! 48A on the 12v rail. Should handle and single GPU out there with room to spare!
620w - 1 x 6 pin & 1 x 6+2 pin (8 pin) PCI-e power connectors.

All come w/3 yr. warranty too!

Edit: Forgot to mention that these PSU's don't come with the power cord (trying to be ECO friendly).
a b À AMD
December 12, 2011 1:36:21 PM

If that sticker is accurate, it looks like the specs are very close to the 26 amps you thought you had, but as said, it does not always work this way.

I feel more optimistic that "If" it can deliver what it says, you should actually be fine.

I like to think of AMD's recommendations being slightly overboard to include lower end power supplies as well as very high end systems(Power sucking cpus and the such).

If you have already started looking at power supplies, it is still a good idea.
December 12, 2011 2:04:34 PM

Hmm..i was looking at the Corsair CMPSU-650HX Professional Series 650W Power Supply for future upgrades, IF my dual core wont be too big of a bottleneck. BUT if you think it would work, and if i get some more confirms from other people i might just try ( I understand pretty much nothing from this sticker, if it delivers or not ) :) . I'm not planning to OC anyways. But yea i'll wait for some more replies and if they actually say it's worth it, i'm gonna try, if they don't, i won't :) .
December 12, 2011 3:07:08 PM

Well if you want a little more info on what I'm running, which is a bit more power hungry than your proposed build (except for any OC'ing). Here is what I'm running:

* Intel e6700 at stock speed 2.6 gHz
* MSI P35 Platinum s775 Mobo
* AMD 6850 GPU
* 4 x 1 gb DDR2 800 mHz RAM
* 3 x SATA HD's
* 2 x DVD drives (1 DVD burner and 1 DVD ROM)
* Cooler Master 912 HAF case w/3 120mm fans!
* Antec 380w Earthwatts PSU w/28A combined on the 12v rails (sticker has a 17A and a 15A 12v rails, but the sticker also includes maximum wattage at 336 watts on the combined rails - 336w/12v = 28A).

Now you could be fine with running the 6770, which is less power hungry than my 6850, so you could be fine, but I think your starting to understand all of our concerns.

Edit: I forgot to mention that I don't currently play Skyrim on this computer, but I think that I shouldn't have any issues with my setup with Skyrim. My son's computer is running with an AMD Athlon II x3 @3.1 gHz w/a AMD 4850 512mb GPU on 1920 x 1080 resolution and isn't having any issues whatsoever. Of coarse he has 6 gb's of RAM, but I'm reading that 4 gb has been working just fine with Skyrim.
December 12, 2011 5:26:32 PM

Thanks for your help, i still have some time to think so i'll see :) . I just checked in my case if i had room for the 6770, and according to the internet, i could fit a 6970 in there which is kinda odd ( a regular midi tower pc case ) .
a b À AMD
December 12, 2011 9:00:34 PM

I like how they put a line there instead of the 12V combined output. Made me laugh.

650W would be way overkill, even if you used CF. The 6770 uses only one 6pin, and has a power draw of around 110W. Two in CF would be 220, and a normal 95W CPU comes up to 300W(ish) Anything that can do 350W on the 12V rail would be fine, and that 650W Corsair can do a lot more. 350W is only around 30A, so even my 34A 500W Antec could power a CF 6770 setup. Unless you are getting a great price or are getting a bigger GPU, I'd save some $$$ and get something a bit smaller.
a b À AMD
December 13, 2011 2:33:30 AM

4745454b said:
I like how they put a line there instead of the 12V combined output. Made me laugh.

650W would be way overkill, even if you used CF. The 6770 uses only one 6pin, and has a power draw of around 110W. Two in CF would be 220, and a normal 95W CPU comes up to 300W(ish) Anything that can do 350W on the 12V rail would be fine, and that 650W Corsair can do a lot more. 350W is only around 30A, so even my 34A 500W Antec could power a CF 6770 setup. Unless you are getting a great price or are getting a bigger GPU, I'd save some $$$ and get something a bit smaller.

A bit old +1 for that /\

My media center has a 5770(same as a 6770, but with "3d" support by way of hdmi 1.4 iirc) and a I5 750 and I found a 300 watt FSP unit(SFX form factor 22Amps combined. I am not going to lie, I have had very good power supply luck) to be more then enough for that system.

If you want max efficiency however, getting just under double the average power of the system will in fact hit the highest efficiency.
December 13, 2011 3:12:20 AM

2506219,44,71107 said:
I like how they put a line there instead of the 12V combined output. Made me laugh.

650W would be way overkill, even if you used CF. The 6770 uses only one 6pin, and has a power draw of around 110W. Two in CF would be 220, and a normal 95W CPU comes up to 300W(ish) Anything that can do 350W on the 12V rail would be fine, and that 650W Corsair can do a lot more. 350W is only around 30A, so even my 34A 500W Antec could power a CF 6770 setup. Unless you are getting a great price or are getting a bigger GPU, I'd save some $$$ and get something a bit smaller.[/quotemsg

So is the line instead of the max output a bad sign?
a b À AMD
December 13, 2011 3:29:34 AM

It is an older power supply. They may have just put it there since it this case adding works.

Hell they may actually be 2 separate rails not linked in any way.

Older power supplies used to have separate everything(5 and 3.3 linked in some cases) modern power supplies step down to 12 convert it to DC and get the 5 and 3.3 of that same 12 volt rail with regulators(this is why you sometimes see 3.3 + 5 + 12 = more then a power supply delivers. Take more from the 5 and 3.3 and you take a bit off the total 12 volt limit and also the reason you can not take 20A on every rail of the power supply pictured above[Antec TP550] because there is only 45 to go around).

The standby and others are still separate on many power supplies.

I have seen the same slash line on some older Seasonic(A very respectable maker) units.
December 13, 2011 3:48:36 AM

Hmm okay, well i hope then that my psu has near 26 amps, but to hear that u got a 22amp 300w psu makes my face suprised, altho that is a good brand psu so yea....
a b À AMD
December 13, 2011 3:56:19 AM

CryArctic said:
Hmm okay, well i hope then that my psu has near 26 amps, but to hear that u got a 22amp 300w psu makes my face suprised, altho that is a good brand psu so yea....

Very careful part picking(ok MITX boards take less power. Its a small system with only 1 expansion slot) leads to a system that does not draw more then 180 watts under the worst case and about 140-150 on most games round it out with a 40 watt idle. Those are from the wall measurements.

I am a big believer that a computer does not need to draw 400-500 watts to be useful.

My Gaming system(2600K @ 4.4 and a 5870) takes about 90-100 idle and loads at 250. Max i have got it to was just under 300. My I7 920 system took more power at only 3.6.

This does not mean I recommend people go get a 300 watt power supply(500 or so would give me the best efficiency, but I already had a Corsair HX850, so in it went).

I am more willing to risk my own hardware(if i burn it, i get to upgrade :)  ) then others.

Why do I worry about no name power supplies?

I went to a lan party some time back, A guy won an Antec 120mm fan.
Pluged that shiny new 120mm fan into his "500" watt turbo gamer/aspire/apex(all the same thing) power supply and boom no more powering up.
Remove it, system powers.

I even tested it on my machine in case it was a short(i am nice like that, hell even had a space nic/video card/hard drive/memory just in case someone needed it. funny how things break at a lan party).

I had and Antec Sonata with it's stock 380 watt power supply and a near identical system with 2 of the same fan's already in it and 4 hard drives and that power supply still works to this day, but its low efficiency and high head output means its just a backup for someones system now days.
December 13, 2011 4:11:47 AM

I agree with the nukemaster on not needing a big PSU, but I do have a caveat with it though. USE QUALITY PSU's! FSP is a good PSU manufacturer along with several others. I cringe when someone uses a low quality PSU and complains that their system is stuttering and blue screening. They then state that their 550w PSU is running their SLI'd 460 gtx's and wonder what could be wrong! Lol!
!