Possible bottleneck?

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recoveringknowitall Posted: Thu, Aug 7 2008 8:30 PM

I'm using a 500w OCZ PSU to power my system. It has 2 rails for a combined 36A which is the dead on min. req. for my evga GTX260.

Rest of specs: E4600 @ stock, 2gb 6400 C5, 1 hdd, 1 optical.

My question is: Stability aside, could an underpowered PSU hold my card back?

I ask because I've run an 8800GTS(G92), a 9800GTX, a 4870 and the 260 in this sytem and performance has been almost identical across all 4.

If not the PSU, then could the cpu be the culprit? I suspect not based on what I've read, but I want some oppinions.

BTW: As I mentioned the CPU isn't OC'ed, nor is the card.

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warlord replied on Thu, Aug 7 2008 10:01 PM

The power supply is certainly  pushing the ragged edge. However the reason why those cards didn't scale wasn't the psu it's your cpu  holding ya back. Those chips can easly push 3.0ghz  overclocked and that would give your card the room to streach its leggs a bit.

Fold on HotHardWare

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I would suspect the CPU. I would not try to overclock unless you get a new PSU though. A PSU won't affect speed but it will affect stability. If your system is pulling to much power it will crash bluescreen and eventually kill you PSU.

Edit: beat me to the post button again warlord!

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After crunching the numbers, I found that you guys are absolutely right.

Here's the data:

3Dmark06 run on XP with my 2.4ghz cpu yields the following for my GTX 260 - SM 2.0 = 4729, SM 3.0 = 5699

3Dmark06 run on Vista with 3ghz quad(HH review setup) yields the following for the same card - SM 2.0 = 6088, SM 3.0 = 6408

As you can see, that's quite a disparity.

I have a micro Intel board w/ G31 chipset(got a micro cuz I wanted a small case)that doesn't allow OC'ing, so I think my solution will be to pick up a sub $100 board that will allow some. I'd rather get an E8400 and just drop it in, but I can't afford that right now.

Thx alot for the replies guys, HH community FTW!!!

BTW: My system seems stable with my current PSU so if I can somehow swing the E8400 will my PSU still suffice? My guess is yes since the 8400 is also 65w like my 4600 and the min. PSU req. listing for the card assumes a system with a 130w quad.

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warlord replied on Thu, Aug 7 2008 11:00 PM

Your psu is having to oprate right at its limit and evently and considering brand name probably sooner rather than later. The problem is it could and possibly will take something with it. I hence at the thought that it could be your gpu that bites the big 1

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You're probably right. I should probably look into getting @ least a 600w with 40-50A.

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warlord replied on Thu, Aug 7 2008 11:49 PM

Are you on the folding team yet? With that system you should enter our folding contest.

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Trying to kill my chances aren't you warlord. Just kidding you should fold! Buying a new PSU is the most painfull part to purchase bacause you seem to get nothing from it. At least with a case you get something to look at and maybe better cooling, however I had a string of bad mobos a while back. 4 died in 6 months. I could not figure it out. I upgraded my psu and I have yet to have one die since. Also I'm very excited about DFI's new lanparty jr. boards. MicroATX boards with all the overclocking features of a full ATX board plus dual X16 slots for gpus. Not sure if there out yet but if your a fan of small cases I would look into them.

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