I know the XFX 5870 needs a power supply with 2 6 pin connectors im not good with power supplys so can someone please recommend a good one and one more thing the motherboard is
ASUS P6X58D-E LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Xtreme Design w/ SLI, TurboV, SATA 6Gb/s +USB 3.0 link is http://www.newegg.com/Product/Product.aspx?Item=N82E168... just copy and paste and processor is intel core i7 920 or 930 not sure yet but anyway can you guys pls reccomend a good powersupply for this gaming rig im bulding thanks.
If you'll be using 1 5870, you need a power supply with at least 30A on a single 12V rail or when it has multiple rails at least 2 with at least 18A each (the processor uses right around 12 while the 5870 requires 18A). Additionally, in the case of one 5870, you'll need around 400W combined on the 12V rail or you'll be underpowering the video cards. A power supply with this criteria that can run your system and the 5870 will have a total wattage between 550 and 650 to cover your other components.
If you'll ever be using 2, you need a power supply with at least 48A on a single 12V rail or when it has multiple rails at least 3 with at least 18A each. You PSU's 12V rail will need around 600W combined or you'll be underpowering the video cards. A power supply with this criteria that can run your system and the 5870 will have a total wattage of 750 on up. Go for 750W+ in this case.
Either way always make sure you have the Amps (A) on the 12V rail.
Shoot for an 80-plus rated power supply. Always tend toward the high side when getting a power supply as they become less efficient as they age and over time your other components require more power because they become less efficient as they age.