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Old 01-17-2011, 01:28 PM   #1
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Default what power supply do I need?

I am considering adding a second graphics card and running SLI. I currently have a 700W power supply but I am pretty sure its not enough?

PC comprises

EVGA Nforce 680i enthusiast board
CPU Dual core E6600
4 x 1GB sticks of Gskill DDR800 SDram
Zalman 9500AT CPU cooler
XFX 8800 GTX XXX 756MB graphics (will be 2 of these)
2 Samsung lighscribe DVD writers
2 x 120mm case fans
Win TV card for second monitor
2 22" monitors (but no power from PC for these i guess)

I tried to work it and think it needs to be over 900W!!!! but not sure if I am working it out correctly. UK 240V power supply

Any ideas???
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EVGA 680i enthusiast board 1066Mhz FSB, 4Gb DDR800 GSkill RAM, 450GB HD + .5TB external, PNY Verto GeForce 8800 GTX Graphics adapter,overclocked. Zulman CPU cooling, Thermaltake ToughPower 750w Modular SLI Certified Power Supply.
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Old 01-17-2011, 01:34 PM   #2
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Default Re: what power supply do I need?

700W is more than enough for 2 8800GTX, however, that is assuming you have a high quality power supply. What manufacturer/model is it?
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Old 01-17-2011, 01:37 PM   #3
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Default Re: what power supply do I need?

Thanks, its a good one its a Thermaltake Toughpower 700 watt. I thought the GTX took up to 280W each and with the other stuff it would not cope?
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EVGA 680i enthusiast board 1066Mhz FSB, 4Gb DDR800 GSkill RAM, 450GB HD + .5TB external, PNY Verto GeForce 8800 GTX Graphics adapter,overclocked. Zulman CPU cooling, Thermaltake ToughPower 750w Modular SLI Certified Power Supply.
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Old 01-17-2011, 02:03 PM   #4
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Default Re: what power supply do I need?

Quote:
Originally Posted by chin00k47 View Post
Thanks, its a good one its a Thermaltake Toughpower 700 watt. I thought the GTX took up to 280W each and with the other stuff it would not cope?
No, 155W TDP. 700W is plenty.

The toughpower units are the only half decent units that Thermaltake make, so you shouldn't have any problems with it
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Primary::: Asus M4A79XTD EVO | AMD Phenom II x3 720BE @ 3.4GHz | 2 x 2GB Corsair 1600MHz | XFX HD5770 + eVGA GTX260 Physx | 500GB Samsung F3 + 520GB Storage | Corsair Obsidian 700D | Win 7 Ultimate x64
Secondary::: Asus P5N32-E SLI Plus | Intel Q6600 | 2 x 1GB Corsair 800MHz | Gigabyte 9800GT | 180GB Caviar Blue + 250GB Storage | Win 7 Ultimate x64
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Old 01-17-2011, 02:14 PM   #5
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Default Re: what power supply do I need?

ok thanks

not sure now, have no pcie connectors and would need to use 4 Molex i guess. and its gonna get very cramped inside the tower so might just leave it alone? would I be better getting a quad core and sticking it in instead?
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EVGA 680i enthusiast board 1066Mhz FSB, 4Gb DDR800 GSkill RAM, 450GB HD + .5TB external, PNY Verto GeForce 8800 GTX Graphics adapter,overclocked. Zulman CPU cooling, Thermaltake ToughPower 750w Modular SLI Certified Power Supply.
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