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5770 crossfire and 52A on 12V+

Last response: in Graphics & Displays
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September 24, 2010 3:26:27 PM

Hi, i just bought a sapphire 5770 and i thought that 600W is recommended for the crossfire, but then in alot of forums and a review i saw before i saw that the minimum 12V+ of the PSU is 55A, so my current PSU that i bought for this rig produces 52 on two 12V+ (30 + 22), so will that be enough for the crossfire

my current config:
CPU: AMD Phenom II X4 955
Mobo: Gigabyte 890GP
RAM: 4Giga DDR3 1600
1 HDD 500G SataII
1 DVD-RW
2 120mm Case Fans

More about : 5770 crossfire 52a 12v

September 24, 2010 5:33:16 PM

Yes, it's fine, a HD 5770 needs some 10A max.
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September 24, 2010 5:50:40 PM

Should be no problems, but I'd like to see the make and model of the PSU first.
Not every unit can deliver what it promises and some makers are known to overinflate (lie) about the outputs of their products.
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September 24, 2010 6:11:53 PM

I think this is legit review ;

http://www.guru3d.com/article/radeon-hd-5770-review-tes...

I own 5770 for almost year now...sure it's going to " run" (my previous psu was 650W 38A on single 12v rail) but you wont be playing,it wont be stable..just saying
If you not going to OC. you will be ok..i guess
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September 24, 2010 6:31:49 PM

Well first of all, your calculations are wrong. You do not simply add the amperage given on each 12v rail and say that's your total amperage. What power supply do you actually have?
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September 24, 2010 9:09:40 PM

skolpo said:
Well first of all, your calculations are wrong. You do not simply add the amperage given on each 12v rail and say that's your total amperage. What power supply do you actually have?


but here's what it says in the link that ortoklaz just posted.......
Quote:
That power supply needs to have (in total accumulated) at least 55 Amps available on the +12 volts rails.

which means the do calculate the total of the 12V+ amperage
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September 24, 2010 9:24:05 PM

kaspro said:
but here's what it says in the link that ortoklaz just posted.......
Quote:
That power supply needs to have (in total accumulated) at least 55 Amps available on the +12 volts rails.

which means the do calculate the total of the 12V+ amperage


You do not add the two rails together to get the total amps from a power supply. You take the 12v Watt output and divide it by 12. In your power supply, the output is 504. 504 divided by 12 is 42. You have 42Amps in the 12v rails.
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September 24, 2010 9:36:47 PM

^+1
If you got your mine set on CF or SLI your PSU wont do it
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September 24, 2010 9:57:24 PM

Oh, is that what you think too skolpo that my PSU wont run it, and if that so, what PSU would you recommend guys?!!!!!!
and Thanks for the help!
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September 24, 2010 10:28:05 PM

kaspro said:
Hi, i just bought a sapphire 5770 and i thought that 600W is recommended for the crossfire, but then in alot of forums and a review i saw before i saw that the minimum 12V+ of the PSU is 55A, so my current PSU that i bought for this rig produces 52 on two 12V+ (30 + 22), so will that be enough for the crossfire

my current config:
CPU: AMD Phenom II X4 955
Mobo: Gigabyte 890GP
RAM: 4Giga DDR3 1600
1 HDD 500G SataII
1 DVD-RW
2 120mm Case Fans


with an over clocked i7 CPU and the ATI 5770 in crossfire, you wont break 400w.

FYI, your PSU has 42a on the 12v. you don't add the amps together on the 12v to figure out your total. It's based on the watts your 12v provides.


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September 24, 2010 11:11:57 PM

dude..you dont have to be rude,just point out what you disagree with
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September 24, 2010 11:13:30 PM

like the other few said should be fine with a quality psu. i seen this all over the place when i was picking my power supply. my future plans are to crossfire 5770 to so i picked the specs based on that. there is alot of setups with a 650w 52amp antec corsair yada yada working fine according to users. yours looks nice spec wise 80+ pfc so on and has 2 pci-e so your prolly good to go. even says on the table supported devices grtaphics card on each rail. if what the other guy said was correct about 10 amps you still have 12 left on the 2nd rail for the cpu er however that works i dunno :p  sorry i started smokin half way into this post and rambling now lol

oh and to the other guy hes not being rude at all when your going around telling someone to purchase a 850w 170$ psu for crossfire 5770 lol
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September 24, 2010 11:15:07 PM

Youll be fine, dual 5770s take ~160W and the CPU maybe ~120W OCed. Which runs you less than 300W on high GPU/CPU load.

Though Hec isn't the best company around, its high-end line is still capable of providing its rated power for the most part.
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September 25, 2010 12:07:47 AM

^Thats the usage for the whole system, including the Mobo, GPU, Hard-drives and without factoring the PSUs efficiency, which proves my point that the stock 955 barely uses 100W on load.

Heres your picture by the way, it says with a 3.8Ghz i7, the whole system uses barely 370W on load. HX850 much?
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September 25, 2010 12:18:09 AM

ok you ad HDDs +couple fans+nice heatsink+....good luck
I'm not a hater i'm participater LOL
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September 25, 2010 12:24:24 AM

HDDs use 5W each, fans barely use 3W and heatsinks use no electricity at all.

Unless you plan to run a RAID farm in your case (it only hold ~6 in most cases) or drill holes for a wind tunnel (usually a case holds 5 fan MAX at stock) the added power would be less than 45W.

Real world usages will be even lower due to the fact you will rarely read all 6 drives at the same time and 5 fans running at full speeds is pretty unbearable after a while.
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September 25, 2010 12:27:44 AM

im running 3 hard drives, overclocked Phenom II x4 @ 3.68mhz. 3gb of Ram, etc, etc. and iv tested crossfire 5770's on a 650w. works fine. so i doubt you'll have a problem.

850w is not necessary
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September 25, 2010 1:02:30 AM

ortoklaz said:
the numbers on paper are not whats reality ,but if you like numbers here is 955 no oc.
]http://img16.imageshack.us/img16/2196/powerq.png

Uploaded with ImageShack.us

http://www.tweaktown.com/reviews/2983/his_radeon_hd_577...

the bottom line is you want good stable power supply,why you want to second guess down the road?


so let me get this straight, you just posted that an entire system with the 955 won't break 220w and you think you need 850w to run the ATI 5770 in SLI??? :pfff: 

P.S. I was not being rude, I was being accurate. Your opinions have no facts to support them, are incorrect and on the verge of idiotic....actually they are past the verge.
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September 25, 2010 1:13:16 AM

the 850 was from top of my head ok ?"what PSU would you recommend guys?!!!!!! " you could post your favorite to, this is not the point..you guys get so technical and all this and that..but next year when he would want to upgrade to a lot more powerful set up,insted of spending 100$ extra now he will spend 250+
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September 25, 2010 1:17:18 AM

Why? PSUs are not gonna magically increase in price next year.

Besides, Spending $250 now then $100 later is the same thing as spending $100 now and $250 later, with the second option he might even get better/newer products.
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September 25, 2010 1:22:10 AM

ortoklaz said:
the 850 was from top of my head ok ?"what PSU would you recommend guys?!!!!!! " you could post your favorite to, this is not the point..you guys get so technical and all this and that..but next year when he would want to upgrade to a lot more powerful set up,insted of spending 100$ now he will spend 250+


1. he already has a PSU that will work!
2. being technical is the point for recommending hardware....it is technology after all
3. have you looked at the benchmarks for the ATI 5770 CF set up? It runs everything thrown at it at 1080p. Why would you upgrade in a year??
4. if anything the ATI 5XXX series and the Nvidia GTS 450 & 460 show that cards are becoming more energy efficient.
5. your last line makes no sense, no clue what you are trying to point out.

P.S. I think the top of your head needs to be examined :whistle: 
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September 25, 2010 1:41:32 AM

ct1615 said:
1. he already has a PSU that will work!
2. being technical is the point for recommending hardware....it is technology after all
3. have you looked at the benchmarks for the ATI 5770 CF set up? It runs everything thrown at it at 1080p. Why would you upgrade in a year??
4. if anything the ATI 5XXX series and the Nvidia GTS 450 & 460 show that cards are becoming more energy efficient.
5. your last line makes no sense, no clue what you are trying to point out.

P.S. I think the top of your head needs to be examined :whistle: 


why in a year? because CF5770 is not that great,it's basically 5870 and there is more than GTS450&460,but you don't care you just want to prove that you know more
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September 25, 2010 1:52:32 AM

i'm sorry you are correct. the ATI 5770 in CF and ATI 5870 are crap cards. Soon to be outdated in less then 12 months, destined to play tetris on low settings...no shadows...0% draw distance....if only all those people listened to you think of all the money they could have saved :cry:  :cry:  :cry:  :cry: 
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September 25, 2010 2:00:19 AM

less then 6 monts
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September 25, 2010 2:46:26 AM

wow
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September 25, 2010 2:49:39 AM

Get back on topic chaps.
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September 25, 2010 6:16:21 AM

Hey people, thank you alot for help..and i'm sorry that the topic took some aggressive ways..its just everyone want to prove his point...
anyway i'm sorry now that i've become little confused

for ct1615 said :
Quote:
FYI, your PSU has 42a on the 12v. you don't add the amps together on the 12v to figure out your total. It's based on the watts your 12v provides.

so now, isnt that little low for it requires 55a on the 12v, or should i care for the watt for the 12v in my PSU produces 500w and i'm not gonna need more than 400w?!

Thanks alot
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September 25, 2010 6:19:14 AM

kaspro said:
Hey people, thank you alot for help..and i'm sorry that the topic took some aggressive ways..its just everyone want to prove his point...
anyway i'm sorry now that i've become little confused

for ct1615 said :
Quote:
FYI, your PSU has 42a on the 12v. you don't add the amps together on the 12v to figure out your total. It's based on the watts your 12v provides.

so now, isnt that little low for it requires 55a on the 12v, or should i care for the watt for the 12v in my PSU produces 500w and i'm not gonna need more than 400w?!

Thanks alot

The card does not and never will need 55a, no card uses that much.
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September 25, 2010 7:49:25 AM

do you mean the single card or in crossfire?
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September 25, 2010 7:54:38 AM

kaspro said:
do you mean the single card or in crossfire?

Have a read of this article it may clear things up for you as to how much power cards do or don't use.
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September 25, 2010 1:14:55 PM

kaspro said:

so now, isnt that little low for it requires 55a on the 12v, or should i care for the watt for the 12v in my PSU produces 500w and i'm not gonna need more than 400w?!

Thanks alot


as I posted in the chart above, your system won't use more then 400w at load. 42a on the 12v is plenty to run the your set up as everyone has stated.

even ATI recommends a 600w PSU and they need to cover for generic PSU so the requirements are more then you really need if you have a solid PSU

"450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode) "

http://www.amd.com/us/products/desktop/graphics/ati-rad...
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September 26, 2010 7:39:08 AM

Thanks alot, i think i'll go for crossfire for my 5770, i even got on my box
(ATI Crossfire Certified, SLI Certified)....and i even found on ati website that they require 600w for the 5830 and 5850 crossfire!!!!!

Anyway thanks for everyone who helped.
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