HD5770/HD5750 Crossfire 500WATT OCZ PSU enough?

[Rast]

Hello,

I just bought a 2nd card for my crossfire setup. I installed the card correctly with CF brige and 6 pins power cable. Now the problem, I Can boot the Bios, pass the bios. And when it want to boot my windows It crashes. then it goes for the reboot loop. again again again ....

So my question, is my 500 WATT OCZ PSU enough to run this 2 cards in crossfire setup? ( 5770 and the 5750 card)

This PSU can easily run my 6970.

(extra information; have 1 HDD veliciraptor, DVD drive, 2 casefan , Intel I5 2500K stock settings + mugen 3. and my gigabyte Z68X-UD3H-B3 running with this PSU )

thanks for any help!

 

[jpeyton]

In my experience, your boot loops sound like a PSU issue. But the two cards are low power, and should not be drawing anywhere near 500W (especially just booting Windows).

Will it boot into Safe Mode?

 

[Fallengod]

This has nothing to do with the PSU. I suggest reading this thread.

http://forums.anandtech.com/showthread.php?t=2227551

That is a known issue with that mobo. Youll need to update your bios to the latest one and make sure your backup bios is the same as the one loaded.

 

[Rast]

In my experience, your boot loops sound like a PSU issue. But the two cards are low power, and should not be drawing anywhere near 500W (especially just booting Windows).

Will it boot into Safe Mode?

haven't tried in safe mode with 2 cards.

I can run easily with 1 card and boot windows.

 

[aaksheytalwar]

If 1 card runs fine then is prolly psu related. Get a quality 750+ watts for some headroom or 850+ watts if you might run 7870 cf in the future

 

[lehtv]

If 1 card runs fine then is prolly psu related. Get a quality 750+ watts for some headroom or 850+ watts if you might run 7870 cf in the future

7870 consumes 130 watts. 650W power supply with four pcie connectors (possibly with adapters) would be easily enough for crossfire.

 

[Termie]

What's does your system memory setup look like? Give both quantity and size of memory sticks.

 

[Rast]

What's does your system memory setup look like? Give both quantity and size of memory sticks.

2x Gskill 4 GB ripsaw total 8 gb

 

[Termie]

2x Gskill 4 GB ripsaw total 8 gb

Ok, that sounds fine. I thought maybe you had a mixed memory setup, which is what I had when I crossfired my card...and it didn't boot up. Had to remove the extra non-matching set of ram sticks.

Honestly, while your PSU isn't top-notch, it should be enough to power those two cards, which even under gaming load in your system wouldn't come close to hitting 500w.

I would test both cards separately to make sure they both boot to Windows, then I would try them together with each one as the master card (switch the positions of the cards in the motherboard). You can also try booting without the crossfire bridge - this will not allow crossfiring, but it will have a similar PSU load upon booting. If that works, then you pretty much know it isn't a PSU problem but a crossfire problem.

 

[thestrangebrew1]

Can you crossfire a 5770 & 5750? I thought they had to be both a 5770x2 or 5750x2 and not mixed? I ran 5770s before switching to a 570gtx so it's been awhile but I didn't think you could do this.

 

[fffblackmage]

^