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Upgrade to 4850, but power supply issues

Forum Graphic & Displays : Graphics Cards - Upgrade to 4850, but power supply issues

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eliastiong   07-27-2008 at 03:23:08 PM

Hey people, I'm new around here and I was hoping someone might be able to help me out.

I just bought a new computer, specs are:

2.53Ghz Core 2 Duo E7200
4096MB DDR2 Interleaved RAM
250GB SATAII Hard Disk 7200rpm
Elitegroup 945GCT-M2/1333 Motherboard; 1333 Mhz FSB
Inno3D GeForce 8600GT 256MB DDR3
Windows Vista Home Premium
450 watts PSU

I think I'm not too satisfied with the graphics card, and as the title says I am intending to upgrade to a 4850 but will a mere 450 watt PSU be able to handle the load? How do I calculate the power required by all the rest of the individual components?

Please help me out, I'd really appreciate it.

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foxhound009   07-27-2008 at 03:33:36 PM
- 0 +

it depends what kind of psu is it....

was it cheap...? then I doubt it.

If you don't want to spend alot of money on PSU
try buying some cheaper but with say.. 550 watt
or so...

btw check at where you wanna get that PSU
the prices of given PSU's and come back here.

Message quoted 1 times
Reply to foxhound009
Nik_I   07-27-2008 at 03:35:13 PM
- 0 +

it all depends on the brand/quality of your psu. the 4850 requires a minimum of 450 watts, so if you're using a psu that came with your case or cost $10, then you definitely need a new one.

Reply to Nik_I
lobhob   07-27-2008 at 03:47:41 PM
- 0 +

How many amps does 12v have? If it has at least 30 you should be fine, unless you're doing something extra that you didn't label because I calculated your power usage (even put some overclock on cpu if you ever want to do that) and it came out 312 watts. That 450 watt minimum they have labeled on that card is more safety precaution so that consumers actually check their psu's.

Reply to lobhob
DellUser1   07-27-2008 at 05:02:58 PM
- 0 +

foxhound009 wrote :


If you don't want to spend alot of money on PSU
try buying some cheaper but with say.. 550 watt
or so...



This is not a very good reccomendation
Check the specs of these cheap psu's

http://www.newegg.com/Product/Prod [...] 6817184008

http://www.newegg.com/Product/Prod [...] 6817707015

Notice how the +12v output remains the same (22a), even though one is 450 watts and the other 550 watts.



------------------------------ q9650 @ 4.050 | Asus Rampage Formula | 2x2 & 2x1 Corsair Dominators | WD Black 640 x2
EVGA GTX260 Core216 @ 686/1479/1103 | Antec TPN 750

 

Reply to DellUser1

SonDa5   07-27-2008 at 05:52:21 PM
- 0 +

Corsair TX450W is a good PSU for the HD4850 at a decent price from Newegg.

If you plan on OC or going CF get a decent 650W+ lke Corsair TX650W.

Reply to SonDa5
eliastiong   07-28-2008 at 10:36:28 AM
- 0 +

Thanks for the quick replies!

Might I ask, by the way, how does the 12V output affect your computer?
And also how do I calculate the number of amps I have on a 12V?
I also read something about 12V rails or something like that, what's all these stuff?

Forgive me, I'm a little muddled when there're so many things I have to consider.

Reply to eliastiong
SonDa5   07-28-2008 at 10:55:29 AM
- 0 +

A "single RAIL" rated at least 31 AMPS is what I remember is what ATI recommends for the 4850. So when you buy a PSU check out the specs and make sure it can handle that.

The Corsair TX450W can handle it. Most quality PSU will include specs like "single RAIL".



Message quoted 1 times
Reply to SonDa5
gmanvbva   08-07-2008 at 06:57:33 PM
- 0 +

According to some reviews/tests the 4850 draws roughly 275W of power when fully loaded. That means it needs (roughly) 23A.

Of course, that is at stock speeds. So it's probably more like 25A+ if you are overclocking it.


Message edited by gmanvbva on 08-07-2008 at 06:58:58 PM
Reply to gmanvbva
Kari   08-08-2008 at 01:12:51 AM
- 0 +

^^I think this is what qwanvbva is referring to
http://www.theinquirer.net/gb/inqu [...] -4850-4870

267W is for the ENTIRE system. They did some math and came up with a 134W for the card itself, which is more plausible since the card has one 6 pin pcie power connector that can supply around 75W and the slot itself another 75W...

and those manuf recommendations are overly cautious anyways, I'd say the OP will be just fine with his current PSU, anyways invest into a kill-a-watt type consumption meter (like $20 or something) and measure what your usage is with the new card, if it gets say over 75% of the rated wattage then it might be a good idea to get a bigger psu (and thats not taking into account the effiency of the PSU, it'll draw more from the wall than the components actually use)

Reply to Kari
gmanvbva   08-08-2008 at 01:49:45 AM
- 0 +

As I stated in the other thread. I did misread the table but I have also seen two other reviews that state a 4850 uses roughly 250W and a 4870 275W+.

One of them also compared the power draw to other major cards.

Perhaps I misunderstood the others.

I'll see if I can dig those up as well and verify it.

Reply to gmanvbva
gmanvbva   08-08-2008 at 01:55:21 AM
- 0 +

doublepost


Message edited by gmanvbva on 08-08-2008 at 01:55:55 AM
Reply to gmanvbva
gmanvbva   08-08-2008 at 02:12:59 AM
- 0 +

After going back and reading a half dozen or so reviews again. Some state total system power and some only mention the numbers as "the cards power consumption".

A couple have actually added notes that the power consumption is for total system power.

Reply to gmanvbva
gmanvbva   08-08-2008 at 03:57:23 PM
- 0 +

SonDa5 wrote :

A "single RAIL" rated at least 31 AMPS is what I remember is what ATI recommends for the 4850. So when you buy a PSU check out the specs and make sure it can handle that.

The Corsair TX450W can handle it. Most quality PSU will include specs like "single RAIL".



After going back and reading more... This is inaccurate. ATI recommends at least 31A on the 12V rails (total).

Reply to gmanvbva
gmanvbva   08-08-2008 at 05:10:24 PM
- 0 +

BTW, I feel 134W is dangerously close to the 150W maximum draw (75W from PCI-E bus and 75W from the PCI-E connector) since these are at stock settings. I would be curious to see if anyone has tested the power draw when they are overclocked.

Then again, they say to take off ~20% due to the PSU's inefficiency. So that probably makes for any added power requirements from overclocking.

Message quoted 1 times
Reply to gmanvbva
gmanvbva   08-08-2008 at 05:40:49 PM
- 0 +

I also posted some more information in a related post.

http://www.tomshardware.com/forum/ [...] s#t1851636

Reply to gmanvbva
DellUser1   08-08-2008 at 05:53:42 PM
- 0 +

gmanvbva wrote :

BTW, I feel 134W is dangerously close to the 150W maximum draw (75W from PCI-E bus and 75W from the PCI-E connector) since these are at stock settings. I would be curious to see if anyone has tested the power draw when they are overclocked.

Then again, they say to take off ~20% due to the PSU's inefficiency. So that probably makes for any added power requirements from overclocking.



Think about this, if there was even a chance of the card drawing more power than can be provided by the combination of the slot and the external power connector ATI would have added another power port.
If it will help you to feel better , tests have shown that the 4850 under max load only draws 110 watts
http://www.xbitlabs.com/misc/pictu [...] ll.png&1=1

------------------------------ q9650 @ 4.050 | Asus Rampage Formula | 2x2 & 2x1 Corsair Dominators | WD Black 640 x2
EVGA GTX260 Core216 @ 686/1479/1103 | Antec TPN 750

 

Reply to DellUser1

gmanvbva   08-08-2008 at 06:26:46 PM
- 0 +

Was there a article related to that picture?

Preliminary spec released prior to the release of the 4XXX state the power draw with load to be 120W. So it all seems to be in the right ball park.


http://translate.google.com/transl [...] l=de&tl=en

Reply to gmanvbva
DellUser1   08-08-2008 at 06:51:25 PM
- 0 +

Yes
http://www.xbitlabs.com/articles/v [...] html#sect0

------------------------------ q9650 @ 4.050 | Asus Rampage Formula | 2x2 & 2x1 Corsair Dominators | WD Black 640 x2
EVGA GTX260 Core216 @ 686/1479/1103 | Antec TPN 750

 

Reply to DellUser1

gmanvbva   08-08-2008 at 07:04:23 PM
- 0 +

Thanks. I had started reading that article earlier but didn't make it to page 14 yet.

Reply to gmanvbva
Sus-penders   08-09-2008 at 05:47:51 PM
- 0 +

It should run it if it's a good enough quality PSU. I ran my HD 3870 on an FSP AX450 watt power supply, and I never had any issues with it. The 4850 isn't that much more power...

Just make sure your power supply has a 6 pin PCIe power connector (looks like this http://www.worldofstock.com/closeups/BTE1741.php ) . Some brands come bundled with a molex to pcie connector if your psu dosen't have one (my Visiontek 4850 did, as do Gigabyte and Sapphire).

You can always try, and if it doesn't work get a new PSU.

Reply to Sus-penders
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