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How big power supply needed?

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June 20, 2006 6:50:22 AM

Okay my problem is I would like a intel 805d cpu overglocked to a 3.33, 3.6 or 3.8Ghz together with geforce 7950 gtx sli, the motherboard for this will be (wheen it gets out) asus with nvidia chipset 590-sli. The grafikcard is said to draw 143 watts and here on toms the cpu was found to draw (at max load) 258 to 395. I'll probarbly just take the 3.33 overglocking since it looks like a lot of power for nothing.
Well do you guys think that the "Enermax Liberty Series ELT620AWT" will supply me with enough power? I have NO idear how much power the rest of the computer will draw and how to calculate this... is there some standard way to be sure you got enough power?

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June 20, 2006 3:39:54 PM

I'm sorry but that is one of the stupidest set ups I've ever heard of... you are going to shell out for the most expensive video card available, then you're going to buy the worst dual core processor possible then OC it to the point where it requires more power than everything else on your computer combined?

That monster will require more than 620w if you include all your other system components, which we can't calculate the power draw on since you haven't listed them, and you want to use a modular psu (which are great for some but I personally don't trust them for extreme systems). You're also going to need better cooling to reach the top end of the OC which means water cooling and more power requirements for more fans and a pump.....

I would suggest something with quad 12v rails and 750w (hehe) and if you want modular get the TT toughpower 750.
a b ) Power supply
June 20, 2006 9:15:39 PM

Quote:
I'm sorry but that is one of the stupidest set ups I've ever heard of... you are going to shell out for the most expensive video card available, then you're going to buy the worst dual core processor possible then OC it to the point where it requires more power than everything else on your computer combined?



Ditto.

Have you considered the cost of water cooling and the cost for an extremely powerful and reliable PSU? A water cooling solution will run you somewhere between $130 - $300. A good 700w PSU can cost $70 or more than for a good 500w PSU. I'm taking about a good and reliable PSU from namebrand companies (that excludes Aspire, Coolmax, Thermaltake).

If you're looking for a 700w+ rocksolid PSU recommendation for an overclocked rig then I highly recommend the $450 PC Power & Cooling TURBO-COOL 850 PSU. If that's too much then get something by Silverstone, Fortron, or OCZ.

The extra money you burn on a very powerful PSU and water cooling can get you better CPU then the Pentium 805. But hey, it's not my money.
June 20, 2006 9:58:58 PM

lol

just grab the Pentium D 820
June 21, 2006 11:02:02 AM

well if I only overglock to 3.32-3.8, I don't need watercooling. Anyway I was thinking about going amd but then my problem will be different. I'll post on the cpu forum about that question instead...

But thanks for the replies about the PSU. I tried to do a different thing to figure out if it will be strong enough. In the test here on tomshardware they overglocked the 805d to 4.1 and they used watercooling and a 7800gtx graficcard if I remember corectly. In the review they state that a 500w psu will be sufficient for their setup (for a whole system) so if I sit with a 600w then that would be sufficient as the only thing I'll have bigger from them will be the graficcard which probarbly only draws double of what their graficcard draws in power (which I think is like 70-something watt). So all in all my system should be able to go with a 600watts as I'll probarbly draw less power than they did in the test.
If I miss anything in this conclusion plz tell me.
June 21, 2006 5:20:54 PM

Be more concerned with the amps on the 12v rail than the total watts in the psu. it won't help if 180 watts are used up by the 5v and 3.3v rails which only leaves 420 watts for the 12v rail which is 35amps. This was not enough for my water cooled sli'd system but should be enough for you.
!