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Two HD 5770s on a 600w?

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So, I got my system built and everything, though, I'm not entirely finished yet

I have one XFX HD Radeon 5770 XXX edition, and wanting to buy a ICE q 5770, generally because that was the one i was going to buy before, but it went out of stock. Now that it's in stock, I want to crossfire these two, both have same clock speeds, memory, everything.

My system specs:
2gb G-skill DDR3 RAM 1600
AMD Phenom II X4 95 w quad core cpu
ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD motherboard
XIGMATEK BALDER SD1283 120mm Long Life CPU cooler
XFX Radeon 5770 XXX edition
Kingwin Mach 1 600 watt psu
NZXT M59 case
Western Digital Caviar Black 1TB HDD
Windows 7 Home premium

So, you think I could run two, with a kingwin 600w? And I'm planning to overclock them both.
And RMA'ing my 2nd ram stick since it came faulty, so by the end I will have 4 gigs of ram, plus adding two more fans on the top of my case.

What do you guys on here think?

More about : 5770s 600w

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Graphics card Authority

It should be ok on a quality 600watt, but I don't know kingwins. I've seen some good and really bad kingwins. What are the specs of your PSU?

How many amps on the 12v rail and what is the actual wattage output on the 12v rails?

+12v rails: 2
Overload Protection:105%~150%
Input Voltage: 115 / 230 V
Input Frequency Range: 47 - 63 Hz
Input Current: 10.7A@115V/6.2A@230V
Output: +3.3@35A, +5V@32A, +12V1@22A, +12V2@22A, -12V@0.6A, +5VSB@2.0A
MTFB: 100,000 hours under the following conditions full-rated load, 120Vac input, and 25C ambient

Hopefully that is enough. Thats about all the specs hehe


Ya, you should be safe. ALthough I never heard of your PSU manufactuer. I am running a Silencer 610 PSU with a E8400 CPU and Sapphire 5850. The 5770 is a power saver. SO, You should be fine.
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Graphics card Authority

Yeh, I think you'll be ok. The 600w PSU has 2 PCIe 6 pin connectors, just enough for two 5770s. Two 5770s have an absolute max power draw of 300watts, and less so during load. Your PSU probably can output around 500-550watts on the 12v rails in reality, and your system won't use anywhere near that.

sirbuster223 said:
So, I got my system built and everything, though, I'm not entirely finished yet

I have one XFX HD Radeon 5770 XXX edition, and wanting to buy a ICE q 5770, generally because that was the one i was going to buy before, but it went out of stock. Now that it's in stock, I want to crossfire these two, both have same clock speeds, memory, everything.

My system specs:
2gb G-skill DDR3 RAM 1600
AMD Phenom II X4 95 w quad core cpu
ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD motherboard
XIGMATEK BALDER SD1283 120mm Long Life CPU cooler
XFX Radeon 5770 XXX edition
Kingwin Mach 1 600 watt psu
NZXT M59 case
Western Digital Caviar Black 1TB HDD
Windows 7 Home premium

So, you think I could run two, with a kingwin 600w? And I'm planning to overclock them both.
And RMA'ing my 2nd ram stick since it came faulty, so by the end I will have 4 gigs of ram, plus adding two more fans on the top of my case.

What do you guys on here think?



I have a single gigabyte HD 5770 and the manual says that for a single GPU you need at least 24 Amperes on the +12v rail. I have a 620W PSU with two 12v rails @ 24 Amperes each and my single GPU is running perfectly.

I do however see a possible problem with your PSU and GPU compatibility for a crossfire configuration:

your 12v rails have only 22 Amperes on each +12v rail (+12V1@22A, +12V2@22A) this would be to low for two of gigabytes 5770s I would think... but on XFX's website it says "600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode"

It could be that the XFX 5770 needs less Amperes on the +12v rail So I guess it should be OK.

Just to be on the safe side you should try to find out how many Amperes your XFX 5770 needs on the +12v rail.

Let us know what happens ;) 

sirbuster223 said:
Well I plan on my second card being a HIS Ice q 5. But If i have to get a XFX because of the amperes i will do so


Well thats the thing... It may very well work. I mean, before I bought my 5770 people were saying you need 40A on the +12V for a single 5770. Then I saw that on the box you need at least 24A on the 12 rail (in yellow):







I assume all the 5770s need the same amount of amperes on the +12V rail. Also, they do say that you need a 600W PSU for a crossfire configuration... but its better to be safe than sorry. Try to find out the requirements for crossfire mode: your PSU: 600W, Amperes on your +12V rails: +12v1@22A / +12v2@22A. Now how many Amperes on the +12V does the XFX 5770 and HIS 5770 need for Crossfire mode maybe its less? maybe the same? maybe more?

let us know what happens :) 

What I'm not understanding is how my 5770 works on a single +12v1@22A and not get any voltage problems, or overheating issues or whatever happens when your psu doesn't have enough to handle something. My PSU was build for SLI and Crossfire, but then again it is a older psu that came out, so who knows. Would I have to buy another psu if this is the case??

sirbuster223 said:
What I'm not understanding is how my 5770 works on a single +12v1@22A and not get any voltage problems, or overheating issues or whatever happens when your psu doesn't have enough to handle something. My PSU was build for SLI and Crossfire, but then again it is a older psu that came out, so who knows. Would I have to buy another psu if this is the case??



Well is your 5770 working ok so far? I guess if it is working fine its OK. It is possible that 24A is to give you "some room to work with" and you actually need less than that to run it. Once again this is just a speculation so its best to find out for sure.

I don't want to make you run out and buy a new PSU because according to a manual its supposed to be that way... but if this could be problematic then its best to figure out what is the proper solution.

Both ern88 and BlueScreenDeath say it should be alright.
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