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PSU Bottleneck for overclocking?

M

moeenm

n00b
Joined
May 3, 2011
Messages
8
My Rig is:
AMD Phenom II x4 920 Processor (200MHz x 14.0 @ 1.2V)
ASUS M2N-E SLi Deluxe
2x 1GB Kingston DDR2 667 Unganged Dual Channel
Maxtor 250GB SATA Hard Drive 7200RPM
XFX 8800GTX XXX Edition (630/1000/1345)

And PSU I have is almost a week used CoolerMaster's Extreme Power Plus 500W (Two 12V Rails @ 18A each. One for CPU only, other for peripheral)

My Question is: Since I am already pushing my power to 155W + 125W = 280W on GPU + CPU, if I overclock, will my PSU be at risk if I overclock? Also give me a gaming advice if I am playing Crysis 2 on a 17" Analog monitor, 1024x768 @ Enthusiast

P.S: I have Market filled with CoolerMaster Junk over here. The 80+ Single 12V Rail ones are pretty expensive. The other choices I had were the Expensive CM Silent Pro 650W one and the CM Extreme Power 600W one (18A on two 12V Rails each, same as 500W one).

I wanted to post my question about 8800GTX's power requirement before buying this PSU, but since I only have CM junk lying around, I considered buying the 500W one in my budget. The build is running pretty smooth uptil now with all voltages with a positive offset of 100 - 200mV

P.P.S: I am from Pakistan
 
Bit Tech review claims the 8800gtx uses 315W total system power at the wall when loaded. Assuming 85% efficiency that's really only 268W

http://www.bit-tech.net/hardware/graphics/2006/11/08/nvidia_geforce_8800_gtx_g80/18

They also say "NVIDIA recommends a 450W true power supply to support the GeForce 8800 GTX"

So it depends how bad that power supply is, 2x18A is only 430W. So yes I reckon you can do a medium overclock without an upgrade, if you start pushing the limits though you may run into problems. Personally I would try it and see.
 
Even if you weren't overclocking, I still wouldn't recommend using that really shitty power supply for that system. I highly recommend getting a new PSU, especially if you're overclocking. If you're stuck with Coolermaster, avoid ANY Coolermaster PSU that's part of the Extreme Power, Extreme Power Plus, Gamer Xtreme, or Elite Power lineup. So in other words, go with the Silent Pro series.
stren said:
So it depends how bad that power supply is, 2x18A is only 430W. So yes I reckon you can do a medium overclock without an upgrade, if you start pushing the limits though you may run into problems. Personally I would try it and see.
Click to expand...
Yeah, you don't add up the rails like that. You determine the amperage on the +12V rails by first finding out what's the total combined, max load, combined or max wattage set aside for the +12V rails/section alone. Then divide that total by 12 and you get how much amps the PSU has on the +12V rail.
 
OK, I calculated from Xtreme PSU Calculator that to run @ 2996 MHz (214x14) on stock voltage of 1.2V, I will be leaching extra 10W. My Motherboard supports upto 125W Phenom II series. Just curious if I try overclocking, will extra power surge put my motherboard to risk or not?

The CM Extreme Power PLUS 500W has written on its label that "V1 and V2 combined power must not exceed 431.5W (hooray for me I think).

Already overclocked my 8800GTX with 650/1404/1050 and going stable.

Checked market for the Silent Pro Gold 600W and its whoopy 7K PKR, while I bought mine for 3900 PKR. Already cut short of budget and I am planning to upgrade my 2x 1GB 667 to 2x2GB 800 or 1066.

Thanks for a quick comeback guys. :)
 
moeenm said:
OK, I calculated from Xtreme PSU Calculator that to run @ 2996 MHz (214x14) on stock voltage of 1.2V, I will be leaching extra 10W. My Motherboard supports upto 125W Phenom II series. Just curious if I try overclocking, will extra power surge put my motherboard to risk or not?
Click to expand...
Yes.
 
Danny Bui said:
Yeah, you don't add up the rails like that. You determine the amperage on the +12V rails by first finding out what's the total combined, max load, combined or max wattage set aside for the +12V rails/section alone. Then divide that total by 12 and you get how much amps the PSU has on the +12V rail.
Click to expand...

Agreed, but with that chip and gpu he's unlikely to be pulling 18A on either rail. But yes as a shitty psu it may not even get to 18A so who knows.

I guess what I was trying to point out was that even in it's max load scenario you aren't getting 500W out of the 12V
 
So far, managed to pull out this:


I have lapped my heatsink to achieve better cooling and I have about 10 degrees drop.

Here is PCProbe's screenshot:
pcprobe.png

Room is at about 25-30 so I think its great. I will edit this post after doing some crysis benchmarks, have to go to office.
 
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