Crossfire 7770 One card not working? EPU-4 (EAccesViolation) error ... Please Help

xMGxLewis · Mar 13, 2014

So i just invested in a second 7770 amd GFX card and i have them in with crossfire bridge conecting them. Both cards boot and the fans turn on from the off after a few minute and i type in my password the other card will appear to be on ? Only one fan will be on and the other working fine ? Can someone help or give some advise please.

My Setup:
NZXT Phantom 410
AMD 6300-fx 3.5
2 x 7770 1gb
2 x 4gb Corsair Vengeance
Vista Ultimate (yeah i know)
500w cool x stream psu
500 gb hdd
160 gb hdd
and a gigabyte motherboard also brand new?

ModernWarfare · Mar 13, 2014

can you be more specific on the psu.

xMGxLewis · Mar 13, 2014

It's a corexstream 500w psu that's really all I can say unless there is anything spesific that you want to know . Btw I believe that it I discontinued now

ModernWarfare · Mar 13, 2014

how many amps on the 12volt rail if you can check on the psu.

xMGxLewis · Mar 13, 2014

ModernWarfare :

Well it says that I have duel +12v rails so I can't seem to find it ... (I'm not very good at this sort of thing so I apologise) but does 5 A sound normal because I looked it up and some where it said max output 5Amps ? Is that of use to you ?

ModernWarfare · Mar 13, 2014

12v1 amps 5amps?!?!! if thats so its totally i mean TOTALLY NOT ENOUGH.

barto · Mar 13, 2014

I'm guessing the PSU label is this one?

The two +12 have a combined draw of 37A (444/12=37). Each 7770 has a TDP of 80w which is 6.7A or 13.4A roughly combined. The 6300 FX has a draw of 95w or roughly 8A. So you're looking around about 22A (add a few extra due to heat and higher clock).

Mathematically, it will work. As for quality it's OK. Hardware secrets have a few gripes but nothing particularly major. The PSU may not start if fully loaded down. The only down side is it only comes with one PCIe x6 connection. So you'll have to buy an adapter and mooch off other connections to power the other 7770.
http://www.hardwaresecrets.com/article/OCZ-StealthXStream-500-W-Power-Supply-Review/798/9

ModernWarfare · Mar 13, 2014

nice looking up the psu barto

but this psu is not recommended to run crossfire hd 7770 because of low amps.

barto · Mar 13, 2014

Well yes. AMD suggests a 600W or greater PSU for CF. But it's completely possible to do it with less than suggested. Even if the each GPU and CPU pulled 10A, there's still some space before the PSU craps out. But it doesn't have the best efficiency.

ModernWarfare · Mar 13, 2014

i would get something with atleast 40amps or more on this build.

ModernWarfare · Mar 13, 2014

if you're looking at something cheap this will do.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ NCIX US)
Total: $49.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-13 18:59 EDT-0400)

xMGxLewis · Mar 13, 2014

So to some up it could be that it needs more psu wattage ? Is that what you two great guys are saying ... Thanks for such a quick response too much appreciated

ModernWarfare · Mar 13, 2014

the cx600w is a good variant for this build i recommend it if you're on low budget.

barto · Mar 13, 2014

Yeah, I'm a fan of Corsair products, but I'm going to have to say spend $10 more and get a better PSU.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ Newegg)
Total: $59.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-13 19:31 EDT-0400)

ModernWarfare · Mar 13, 2014

yea thats good also

barto · Mar 13, 2014

Wait, hold on a sec. Don't buy a new PSU just yet. You said the motherboard is brand new? Did you install all of the drivers for it? What motherboard is it?

xMGxLewis · Mar 14, 2014

http://m.ebuyer.com/546762 there is a link to it if that helps?

xMGxLewis · Mar 14, 2014

Also I have install the drivers on the disk so if there are any others no I havent

smeezekitty · Mar 14, 2014

Test each card one at a time to make sure they are both working

xMGxLewis · Mar 14, 2014

smeezekitty :

They do both work as when I turn the pc on the both boot however once I get to vista the other one stops ... ?

barto · Mar 14, 2014

Well apparently, the EP4 is software that controls the motherboard voltage on Asus motherboards. That being said, you have a Gigabyte motherboard. Did you uninstall all the drivers before installing the new motherboard?

http://www.tomshardware.com/forum/267010-30-engine-asus-m4a79xtd
http://www.motherboards.org/forums/viewtopic.php?p=755821&sid=17881e009f1422c1ffba492742d6ffba

xMGxLewis · Mar 14, 2014

if i'm honest i didn't bother as i didn't think that it was necessary so i haven't but i will go and do that now

barto · Mar 14, 2014

xMGxLewis :

Lol. It is very necessary. Personally, I've always felt that a complete re-install of windows is easier and better than removing all the drivers when replacing a motherboard.

xMGxLewis · Mar 14, 2014

ok well is there a way to just remove them without the re-install ? But I do have windows 8.1 in the post coming very soon.

barto · Mar 14, 2014

Painfully, you'd need to know what drivers and software are associated with the old motherboard. Find the manufacturer's support site and see the associated drivers/software with your old motherboard. Device Manager might have some errors for devices displayed in it.

To see drivers and software installed : Control Panel > Programs and Features
To get a list of drivers installed on your PC: http://www.youtube.com/watch?v=8RP2wFhn0xg

All I can say is good luck. Lots of leg work. Typically why it's suggested to do a fresh install. I've actually never been in your shoes. Sorry bud.

Crossfire 7770 One card not working? EPU-4 (EAccesViolation) error ... Please Help

Reputable

Splendid

Reputable

Splendid

Reputable

Splendid

Expert

Splendid

Expert

Splendid

Splendid

Reputable

Splendid

Expert

Splendid

Expert

Reputable

Reputable

Distinguished

Reputable

Expert

Reputable

Expert

Reputable

Expert

Share this page