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roper512
12-31-05, 08:42 PM
Hey all, I made a post several days ago about a problem I've been having..

Found out after scouring forums that I'm not alone and that high end hardware (especially SLI video cards, and 512 meg 7800gtx's in particular) have been very picky..

So for anyone who didn't see my thread, I talked about how before I had two 7800GTX 256meg cards.. They worked great, but then after getting the 512 meg cards I noticed after playing certain games for 5-10 minutes that my computer just shut off! no warning, no bluescreen.. just powers down.. Turning the power back on I get into windows no problem.. Don't even get a message saying "your computer shut down improperly, do you want to go into safe mode?"

Every response I've gotton said "power supply".. I did bunch of stress tests.. memtest86, prime95 all worked fine overnight...

I can play world of warcraft, warcraft3 and fable without any power downs (i run them all at 1920x1200, max everything).

However a number of games cause my computer to power down within a few minutes (black and white 2, civilization 4, quake4)...

Given the advice by everyone that it was a power supply issue (Antec TruePower II 550) I decided to start doing some more research on PSU's.. Unfortunately what I found wasn't very pleasing.

I've been noticing that many people have been having similar issues and there doesn't seem to be "One PSU to rule them all".. Seems like everyone has been having problems with a wide variety of PSU's.. PC P&C, OCZ, Antec, etc.

So I guess all I'm asking is, to anyone who has 2x SLI eVGA 7800GTX 512 meg cards and an A8N-SLI premium board to let me know what PSU they're using. At least that's a start at having to narrow down my problem...

For anyone interested here's my specs as well as what I've tried to fix this problem:

AMD 4400+ X2
Asus A8N-SLI Premium (currently using latest beta bios.. Latest official did not help)
2GB (1GBx2) OCZ memory
2x eVGA 7800GTX 512meg cards
Creative Labs Audigy2 ZS


What I've done to try to fix:

- Ran many stress tests to see if anything else was culprit.. CPU and memory seem perfectly fine.

- Rewired cables going from my PSU to my components to better distribute the load

- Flashed my BIOS to latest official and then latest beta when that didn't work


Thanks for any advice..

Rayman1968
12-31-05, 09:59 PM
I'm running two 7800 GTX's (not 512's though) with a A8N Premium, my vote goes to the PCP & C 510 SLI.

lee63
12-31-05, 10:12 PM
I'm running two 7800 GTX's (not 512's though) with a A8N Premium, my vote goes to the PCP & C 510 SLI. I had the same problem with that PSU and mobo combo, I ended up selling it to jAkUp and it works fine, he has almost the same rig as mine except he has a DFI mobo(xmasgrin) This happend when I had two BFG 256 GTX's in SLi

Stonecoldkilla
01-01-06, 10:03 AM
Well i dont have GTXs but i would recommend the one i have.Its Rock Solid on all rails.It also has 4 12v rails.IT ROCKS and the price is not bad at all.

Silverstone Zeus 650w

http://www.newegg.com/Product/Product.asp?Item=N82E16817163108


Edit:I also want to add that is did try a few ANTECs including the 480neo and the 550w,the 12v rail was a lil down on those,so i took them back and got this one,smooth as silk.




Stonecoldkilla

Cinema4DXL
01-01-06, 01:54 PM
im interested to know as well since i have a friend looking for a new power supply for his rig which is similar to yours
also interested if a dual 12V rail is better than a single 12V

macachia
01-01-06, 02:06 PM
i'm using the enermax 625w liberty on 512mb gtx's, had no problems atall

roper512
01-01-06, 02:24 PM
i'm using the enermax 625w liberty on 512mb gtx's, had no problems atall

with a8n-sli premium?

macachia
01-01-06, 03:15 PM
dfi nf4sli dr expert, sorry

hemmy
01-01-06, 08:06 PM
same thing happend in this review w/similar setup and basically the same PSU

http://www.************/read.php?cID=862&pageID=1929

As we can see, the power supply maintained good, stable power. I proceeded to play Quake 4, Doom 3, Pacific Fighters and BattleField 2 with no problems at all.

Then I went to play F.E.A.R. and was fighting my way through a battle with two guys. I killed them but then moved into a room with four guys and one of the heavy armor guys. Bullets flying, frag grenades exploding, then suddenly the machine shuts off. After yelling a few not so pleasant words, I restarted the machine and went back to the game again, from my last save right after killing the two guys. I started the big fight, and then off the machine went again. I then rebooted and ran the performance test in F.E.A.R., and every time right when I got into the fire fight scene right when I passed the second guy at the end of the room, the machine shut down.

hemmy
01-01-06, 08:13 PM
I would suggest: Any 3 of the PCI-e/SLI ready PSUs from PCPNC here:
http://www.frozencpu.com/scan/se=Power%20Supplies/se=PC%20Power%20and%20Cooling/mp=menu_search.html

or OCZ 600w Powerstream
http://www.frozencpu.com/psu-116.html

Or Enermax Liberty 620
http://www.newegg.com/Product/Product.asp?Item=N82E16817194004

john19055
01-02-06, 09:37 AM
The ocz powerstream 520 would be good enough ,I am useing a OCZ 470watt powerstream and I have two 7800GTCO that are overclocke and my cpu is overclock and I have two hardrives and twoDVD burner and 4 fans and so for it is very stable ,with it's 33amps on the 12v rail.

rudedog
01-02-06, 09:39 AM
I'm running my 512's in SLI with a PCPower and Cooling TurboCool 850 SSI and have no problems what so ever. I was using a 550 version before and still had no issues.

See details in sig.

lee63
01-02-06, 09:43 AM
I dont think this shutting down thing has anything to do with the PSUs, I think somthings up with the ASUS mobos(xmasmile)

xwl
01-02-06, 02:37 PM
DO NOT get the OCZ 600w Powerstream or OCZ 600w Powerstream SLi (they are the same, just with different connectors)
It will not handle 2 x 7800 512s.

I currently have this problem with my 600w powerstream, my system will just shutdown when stressed. I am looking at a powersupply myself. Probably PC P&C 850, but hoping I can find something better priced.

hemmy
01-02-06, 03:39 PM
DO NOT get the OCZ 600w Powerstream or OCZ 600w Powerstream SLi (they are the same, just with different connectors)
It will not handle 2 x 7800 512s.

I currently have this problem with my 600w powerstream, my system will just shutdown when stressed. I am looking at a powersupply myself. Probably PC P&C 850, but hoping I can find something better priced.

I have had 2x7800 512s run on PCPNC 510 SLI, OCZ Powerstream 520 and 600w, and a PCPNC 850

The Pwrstream 520 and 510 Deluxe SLI would shut down, with a new model they worked fine, these cards are really weird

I dont own 2 of those video cards but i was given the opportunity to play around with some stuff 2 weeks ago

roper512
01-02-06, 04:02 PM
I bought the silverstone strider 600w on newegg as lee63 has the same motherboard and video cards I have and ended up having it work with the silverstone.. I'm gonna try it and get back to this thread letting you know if it worked out.

Thanks for all the advice guys!

xwl
01-02-06, 04:57 PM
Great, let us know.

Keep in mind to really stress the cards. FEAR with everything to MAX, softshadows ON and 1600x1200 resolution will shutdown my PC within seconds.

I unplugged some non-essential things, floppy, hdds, dvd-rw, fans, so there is less drain on PSU. I was able to play for about 15min before a shutdown.

Keep in mind that ANY cpu overclock (v.core/v.dram) has great drain on PSU. Videocard OC drains alot aswell.

My specs:

PSU: OCZ PowerStream 600W
VC: 2 x Asus 7800GTX 512MB
CPU: Opteron 175

HYBRID
01-02-06, 08:42 PM
I bought the silverstone strider 600w on newegg as lee63 has the same motherboard and video cards I have and ended up having it work with the silverstone.. I'm gonna try it and get back to this thread letting you know if it worked out.

Thanks for all the advice guys!

Excellent choice modular use what you need better air flow, and less clutter by the way this ps has plenty of power. I own one and its a little on pricey side but awesome.

nukem
01-02-06, 08:52 PM
It seems like a cooling problem. Most motherboards and high end graphics cards will shut off after they reach a certain temp. It sounds like you have a pretty big budget, probably the best solution would be to go water cooling, others get alot of fans and maybe try to run with the case open.

savage70
01-02-06, 09:23 PM
As I am running into the same problem....shutting down completely while playing COD2. I have tried running with the case open and it still shuts down. I think it might be a PSU issue also. But let us know how that PSU performs Roper.

ASUS P5N32-SLI DELUXE
PENTIUM 4 650 3.4
ZALMAN CNPS9500 CPU COOLER
OCZ GOLD 1GB (2 x 512MB) PC 5400
SONY BLACK IDE DVD BURNER
SONY BLACK IDE CD BURNER
SAMSUNG SPINPOINT P SERIES 200GB HD
MSI GEFORCE 7800GTX 512 x (2)
ANTEC TRUEPOWERII TPII-550
ACER 17 INCH LCD MONITOR
THERMALTAKE ARMOR BLACK CASE

roper512
01-02-06, 09:40 PM
Yep, no problem guys, I will let you all know what happens.. I ordered the PSU next day air on sunday evening.. So I hope I get it tomorrow.

I will hook it all up tomorrow night and get some intense gaming in.. Civ4 seemed to drop my computer pretty fast at 1920x1200.. in about 3 minutes.. FEAR I haven't tried yet but I would imagine it would shut it down in seconds like xwl.. WoW runs forever, as does Warcraft3. Although those games aren't nearly as intense as many others..

If this indeed fixes my problem I'm going to make a new post on a few key forums and hopefully give many people insight to how they can go about fixing it.. It may not help them 100% but it might save them months of headache.

Wooly Bully
01-03-06, 07:38 AM
I had that problem and got one of those big PC Power and Cooling power supplies and it fixed it.

xwl
01-03-06, 11:22 AM
It seems like a cooling problem. Most motherboards and high end graphics cards will shut off after they reach a certain temp. It sounds like you have a pretty big budget, probably the best solution would be to go water cooling, others get alot of fans and maybe try to run with the case open.

Nope, that's not it. It's something I tested and for a bit thought that was the problem. I would hit 79C, sometimes 80C and the system would crash. But when you are stressing these card really hard they will hit that. So I tried running 1 card, it reached 79/80C and no crashes. Then I tried SLi again and system shutdown with my GPU temps around 66C. Heat was ruled out as a problem.

Gaffney982
01-04-06, 12:13 PM
I'd have to give 2 thumbs up to the PC P&C Turbo-Cool 510 SLI. Been running my 2 7800GT's with no problems. This is with a Koolance PC3-725BK cooling the memory/vid cards/hard drives and a custom mounted Vapochill XE compressor cooling the cpu.

roper512
01-04-06, 09:55 PM
booya! worked like a charm!

silverstone strider 600watt power supply installed and games have been running with no shutdowns!

thanks again to lee63 for the winning combo and saving me months of headache and to everyone else for their advice!