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Once again, power consumption is overblown (470 SLI)... - Page 3

post #21 of 29
You guys are missing the point about efficiency. A power supply will have its most efficient operation at around 50% load. Yes a lower power psu will get the job done. However, it will run hotter and less efficient.

My 950W psu is complete overkill for my rig, I knew this before I bought it. However, I did my research on this unit and looked at the fan speeds the unit has at various loads and its efficiency. At full load my psu is still in its sweet spot at almost 90% efficiency and never even needs to raise the fan speed above idle.

I chose this psu so that it would run absolutely cool and silent. If you are running a psu colser to its maximum load you can expect higher fan speeds.
    
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post #22 of 29
Quote:
Originally Posted by AyeYo View Post
No. The i3 has a 73w TDP, the same socket i7 is 95w. It'd definitely draw more, but I don't think it'd be anywhere near 100w more.
I'd definitely watch your numbers, especially if you jump to an i7 (especially a 1366). I have an i7-970 (tdp 130w) at 4.02 at 1.24v. It folds at 300w (per the kill-a-watt) all day long. BUT, try running IBT at maximum. On my cpu, it pulls 366w. That's a 20% difference, which could be huge if your skating thin.

Also, if I bump the OC up to 185 bclk (4.25), IBT shows 400w, which is a 10% increase as well.

So I'd be very careful on an i7, because I could never run oc'ed 470's in SLI and a 250 on a 650w psu.
post #23 of 29
Quote:
Originally Posted by Epitope View Post
You guys are missing the point about efficiency. A power supply will have its most efficient operation at around 50% load. Yes a lower power psu will get the job done. However, it will run hotter and less efficient.

My 950W psu is complete overkill for my rig, I knew this before I bought it. However, I did my research on this unit and looked at the fan speeds the unit has at various loads and its efficiency. At full load my psu is still in its sweet spot at almost 90% efficiency and never even needs to raise the fan speed above idle.

I chose this psu so that it would run absolutely cool and silent. If you are running a psu colser to its maximum load you can expect higher fan speeds.
I wrote a whole article on this for your reading pleasure.
http://www.overclock.net/power-suppl...load-myth.html

And the 50% load myth itself came from a misunderstanding of one of my other articles, "On Efficiency", in which I specifically addressed that possible misunderstanding, but a couple people who failed reading comprehension missed that bit and made about five hundred posts about how you should size your PSU so your peak consumption is at 50% load. Which is probably where you heard it.
post #24 of 29
Thread Starter 
Quote:
Originally Posted by jigglylizard View Post
So 470x2 would be about 420W

So ur overclocked CPU + 8800 + rest of the system is about 180W? That's pretty nuts!

I knew that power consumption was exaggerated but its even more than I thought.
I used to have an 8800GTS, 8800GT, and a 8600GT (all OC to their max) with otherwise the same hardware. That combo only pulled ~340w at the wall, with a less efficient PSU.
Finally an update
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post #25 of 29
Thread Starter 
Quote:
Originally Posted by capt_zman View Post
I'd definitely watch your numbers, especially if you jump to an i7 (especially a 1366). I have an i7-970 (tdp 130w) at 4.02 at 1.24v. It folds at 300w (per the kill-a-watt) all day long. BUT, try running IBT at maximum. On my cpu, it pulls 366w. That's a 20% difference, which could be huge if your skating thin.

Also, if I bump the OC up to 185 bclk (4.25), IBT shows 400w, which is a 10% increase as well.

So I'd be very careful on an i7, because I could never run oc'ed 470's in SLI and a 250 on a 650w psu.
Keep in mind that 1156 i7's only have 95w TDP's. I definitely wouldn't run a 1366 i7 with my current GPU's and PSU.
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post #26 of 29
hi guys im planning on adding another gtx 460 hawk and also overclock my proccy to like 3.8ghz and my graphic cards to like 900mhz core so is my power supply decent enough to handle the load without getting into trouble.........
post #27 of 29
Quote:
Originally Posted by ghost_z View Post
hi guys im planning on adding another gtx 460 hawk and also overclock my proccy to like 3.8ghz and my graphic cards to like 900mhz core so is my power supply decent enough to handle the load without getting into trouble.........
Please create a new thread so this one will stay on-topic. You can post here afterward with the link to get people's attention
post #28 of 29
The numbers seem about right...225 watts max possible for a GPU with 2x PCIe connectors, but realistic load would be under 200 each.

So 2x GPUs prolly ~420w
1x PhysX GPU ~85w
1x dual core i3 CPU ~65w
HDDs/DVDs/etc ~ 30w

~600watts

Let's see you try this with a Cool Max 750watt PSU... make sure you have a CO2 fire extinguisher ready...
Edited by Bluescreendeath - 1/8/11 at 3:17pm
post #29 of 29
Quote:
Originally Posted by linkin93 View Post
you are running a dual core though...
Well at 4.4GHz it's probably the using the same power as an i7 930 with a minimal OC.
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