SLI PSU

quote,

The total current for the 12V line is given as 53A in the reviewer's guide and on the web site. This much current would be available on the 12V line only if the other lines were delivering less than 14W (since the maximum rating is 650W). The manual states more completely that 43A is available on the 12V line when the maximum total of 140W is drawn from the 3.3V and 5V lines. In an case, the reader should be aware that total 12V power capability for any ATX12V PSU is not a fixed number, but can vary depending on many conditions,

add up the amps in test5- http://www.hardwaresecrets.com/article/Antec-Signature-650-Power-Supply-Review/658/7 =64amps

then at its maximum before it shut down- http://www.hardwaresecrets.com/article/Antec-Signature-650-Power-Supply-Review/658/8 = 99.5amps
 
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Just reading this and adding this.

The Seasonic x-650 has 54a on the 12v. I have just purchased one, and the fan don't spin (not anything), world apart from the OCZ Modxtream 600w where it's fan was working overtime. I paid £91 for my x-650, check the interweb.
 
Jesus Christ!!!! ego wars. To answer your question both the PSUs in RJC's post will do you fine, if you feel you need the security by all means get a larger 750w one, it will give you some headroom should you do some upgrades in the future.
 
get a http://www.overclockers.co.uk/showproduct.php?prodid=ca-111-an&groupid=701&catid=123&subcat=1088 and use a pair of the hdd to pci-e plug adapters (should have got one with each of your cards), simple :)

if you want the math, a 9800gtx+ draws a maximum of 141w (http://www.nvidia.com/object/product_geforce_9800_gtx_plus_us.html) so two of them will draw a max of 282w, I don't know what CPU you have but one like a the E8400 Core 2 Duo has a 65 watt design (http://processorfinder.intel.com/details.aspx?sSpec=SLAPL), in total that's 347w, which divided by 12v (how we get amps) equals ~29 amps, chuck in another 5amps to cover the DVD drive, the HDD, the motherboard, the RAM and a couple of fans and your looking at a draw of ~34 amps from the PSU when the system is under full load.

In theory a 430w PSU should be able to do it but I would overkill the problem to account for PSU capacitor ageing and future expansion of the system
 
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