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psu effect the performance?

post #1 of 13
Thread Starter 
hi all i have 650w cooler master psu running 2 8800gt sli ,2 hdd,q6600@3.0,4 fans , the question is dose the psu has any thing to do with performance ,I'm talking about the stability i run 6 hours prime95 full loud ,no problem it is just the performance i think my system should be better than what it is now and every thing is fine unless the psu is no good??
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post #2 of 13
If a PSU isn't enough to handle a computer you'll certainly know about it... fluctuations in the voltages will cause random crashes, reboots and BSODs... These fluctuations will also prevent higher OCs as the unsteady voltage provided to the CPU will cause instability... personally, if the system is proven stable, clocked up to what you expected it to, and the voltage on the rails seem to be good (tested with a voltmeter - not software readouts) then you should be just dandy
post #3 of 13
Quote:
Originally Posted by killa_concept View Post
If a PSU isn't enough to handle a computer you'll certainly know about it... fluctuations in the voltages will cause random crashes, reboots and BSODs... These fluctuations will also prevent higher OCs as the unsteady voltage provided to the CPU will cause instability... personally, if the system is proven stable, clocked up to what you expected it to, and the voltage on the rails seem to be good (tested with a voltmeter - not software readouts) then you should be just dandy
very well put. couldnt of said it better myself and this is my area lol.
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Lurking Ninja
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post #4 of 13
Quote:
Originally Posted by aloosh81 View Post
hi all i have 650w cooler master psu running 2 8800gt sli ,2 hdd,q6600@3.0,4 fans , the question is dose the psu has any thing to do with performance ,I'm talking about the stability i run 6 hours prime95 full loud ,no problem it is just the performance i think my system should be better than what it is now and every thing is fine unless the psu is no good??
Hello Aloosh,

I am writing this message to you for several reasons. First because I love computer stuff in general. Second because while I am not a certified pc technician or programmer, I can tell you my experiences with this very same topic/problem. Third because I am trying to work my way a rep+ points to the magic number where I can begin to post messages in the trade section for some pc components such as mb, cpu, and other accessories that I have.

As I stated before I will not talk from a numerical standpoint as I am not a technician. Instead I can give you my practical experience on your question relating to your 8800 sli setup.

Continued below:
LightningPhoenix
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LightningPhoenix
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post #5 of 13
Quote:
Originally Posted by aloosh81 View Post
hi all i have 650w cooler master psu running 2 8800gt sli ,2 hdd,q6600@3.0,4 fans , the question is dose the psu has any thing to do with performance ,I'm talking about the stability i run 6 hours prime95 full loud ,no problem it is just the performance i think my system should be better than what it is now and every thing is fine unless the psu is no good??

I recently sold my Asus 8800GTX on eBay, (still have the Aqua Computer Silver special edition waterblock) and bought two 3870X2 vga cards. I used to have one Ultra X2 550w psu. At first I had used this to power just one 3870x2, when I got the second 3870x2.

I bought a Logysis 550w psu more for the convenience of not having to buy two switching connectors for two 4-pin to two 6-pin pcie connections, as the psu locally was on sale for $39...it would have cost more for the connections with shipping/tax.

Getting back to the issue I noticed a drop in my 3Dmark06 score as opposed to an expected increase, when I first installed the second card, with the new psu.

Also, as the other guys on here have posted I was getting some strange crashes with higher clocks...as well as lots of vga error messages at post. Even before installing the second card, the Ultra went south after one week of adding the second 3870x2 and new psu.

I bought a Apevia 680w psu the next day, and my score with the exact same setup went from 12700 to 18700, everything was the same drivers, pcie slots,settings,etc. Also, the crashes stopped and I have been able to oc at higher rates.

I can say that it's recommended by the manufacturer that you have a 600w psu for one 3870x2, but if you've got your psu zolting your cpu,fans,hdds',dvds',fans, it all matters....especially if you've had a psu unit doing this for 6months or longer...most psu are rated for there output within a given heat operating range.

Once you add more stuff into the psu loop this only makes for an increase heat load matching the added demand. Over time other factors such as high ambiant room temperatures can push a psu to the brink.

Continued:
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LightningPhoenix
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post #6 of 13
I know that you have a 8800 card...yes it has different requirements. Many have said that if you have a 700w psu it can work for two 8800 cards in sli. And I think this is true in general.

Though if you have many other components in the loop this can bring your psu to the brink too~!

And, while many psu are manufactured differently this maybe what determines the toughness of a psu.

Personally, I know that 700w psu for two 3870x2 should work, though for my given situation it is questionable as I have alot of accessories on the 680w psu.

Most enthuiasts recommend 700w for 1-card pcs with alot of accessories and 850-1200 for all out over-kill pc set-ups...

If you have two vgas with one core...I think that 700-850 is over-kill or plenty of juice...but dual core cards take and make alot of heat. I have quad-xfire....and as I stated my scores went up quite abit.

So, I have made three posts here...I hope that it's not to un-technical. Just I am sharing much of my experiences

Please if you got any worth give me some rep+...and I will reciprocate.

Thx
LightningPhoenix
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LightningPhoenix
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post #7 of 13
What do you mean about performance do you have any freezes during e.g. gameplay, or reboots aloosh?
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post #8 of 13
You shouldn't be too worried, you won't have a problem with a 700w. But, with 2 cards consuming this much power and as you said before you have alot of accessories connected to this system, the higher the better. In the enthusiast's world, there is no such word as overkill, there is only performance. PSU cannot directly affect the performance, but if not enough power is given to the cards, performance will obviously be reduced. In serious cases your PC will not even start up.
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post #9 of 13
Thread Starter 
ok
thank u all guys
i have 2 x msi 8800gt oc sli , q6600 @3.0 stok volts, i ran rdmark lime 10 times and ran prime 95 for 6 hours , and i played cryses high settings, world in conflict very high settings x4 aa,grid demo very high settings ,call of duty,... no problem ,it is just the system is not performing as expected and i thought the psu could be the problem 650W
cooler master but the thing is 8800gt requer 12v @28A and this psu 12@19A,
OK PLAN ENGLISH IS THIS PSU http://www.newegg.com/Product/Produc...82E16817171023 GOOD FOR MY SETUP OR NOT
My System
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My System
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q6600 @3.0 -1.28v evga 780i sli 2x msi 8800gt oc sli 2x2 4g ocz 800 sli 
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seagate 250 x2 raid 0 asus vista 32 samsung 22" 
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post #10 of 13
I think that both of us need better psu...it may work but in terms of it providing the max output that your two 8800 cards have listed as minimum requirements I think it is cutting it pretty close.

Most psu always claim more power than they actually have. Point in case is my Apevia 680w which actually reverts to 340w when two pcie connectors are used one one card.

I think you are alright as far as you won't damage your cards or psu...but if you want the maximum power from your cards sli performance...you'll need a higher psu...like 800 or so.

I have decided to get a better psu unit that is 800w that can power both my 3870x2s' as well as the rest of my computer. It should not cost my anything at all once I take the psu back to Fry's for a refund.
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LightningPhoenix
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MouseMouse PadAudioAudio
Saitek Obsidian Lighted Acrylic Onboard RIVE KarmanHardon Soundsticks II 2.1 Speakers 
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