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overclocked GPU power usage

E

ekuest

Supreme [H]ardness
Joined
Feb 23, 2009
Messages
6,094
i have been using this psu calculator, but have recently decided to oc my gpu. i just got a 5850 and would like to overclock it as much as possible, then oc my cpu a little bit depending on how much is ok. i am not sure what the stock vcore of my cpu is, so its hard to tell exactly how much power its drawing. with the gpu i have no idea once its overclocked. should it be the same wattage as long as i dont increase the core voltage of the gpu? is there a better psu calculator that i can use? i do have a multimeter too, so maybe theres some way that i can use that to measure voltages while the computer is ok and find out? just looking for some suggestions here. i will be using a 450W st45sf and a vapor-x 5850, the rest is whats in my sig. thanks!
 
Raising the frequency without raising the voltage will still increase power consumption. I think running an overclocked i7 and an overclocked 5850 would be a little outside the capabilities of a 450W FSP PSU.
 
200W - Intel Core i7 860 @ 3.6Ghz + mobo + single HDD @ full CPU load.
165W - HD 5850 @ stock clocks @ GPU load
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365W @ full GPU and CPU load.

Considering that a vast majority of PC parts draw power from the +12V rail and the fact that the ST45SF only has 36A or 432W on the +12V rail, I would not OC the HD 5850 at all. You only have 62W leftover on the +12V rail. And you don't want to fully load up a PSU that long.
 
thanks for the links danny. got any numbers for an overclocked 5850 to around 850/1200 or for an i7 860+mobo+hdd at 3.2?
 
ok so im at 850/1200 now on my 5850 and i dont think its stable any higher on stock volts. im perfectly fine with that, and so far my psu seems fine with it too. i have undervolted my cpu to 1.20V, stock was 1.22 i think, and OC'd it to 3.014GHz. its prime stable with a high of 67C. and this is with my H50 on dead silent. so with stock voltages on my OC'd gpu, and below stock on my OC'd cpu, how do i tell how much power im using? do i get a kill-a watt and test at the wall? seems like that wouldnt give me a good idea since i dont know exactly how efficient the psu is at my specific load. can i use a multimeter and put the leads somewhere on the solder connections on the back of the gpu or the mobo or something? how do they do it in tests?
 
Using a Kill-A-Watt is basically the only practical way to measure your power consumption.
 
thats too bad. sounds like it wont really help me that much. in other news, my cpu is stable at 3GHz with 1.1V. at load hardware monitor reports 110W for the cpu, at idle it reports 4.5W. looks like i should be WELL within reasonable wattage 99% of the time.

one thing thats weird is that i have seen 2981, 3402, 3288, and 3104mhz all in a row just now in batman AA. i dont understand why it jumps around so much. i have all the power saving features enabled, but all i want is for it to switch between the highest multiplier when gaming, and 9x the rest of the time. what do i need to enable and what do i need to disable?
 
Hardware Monitor's wattage numbers are basically worthless. As for your other question, there's no way to really tweak how Speedstep behaves. It's either on or off. I recommend leaving it on unless you experience real issues with it.
 
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