I am about to purchase a new build. Phenom II 955, Radeon 4870. I do want to overclock, and, in the future, very well may Crossfire, though I am not right now. Which of these two PSUs do you believe to be better, considering price?
OCZ ModXStream Pro OCZ700MXSP 700W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Power Supply compatible with core i7 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This one is the cheaper of the two, being only $60 after MIR, but it only has one 6+2 pin.
Your 4870 does not require 8 pin pci-e connectors, so the number of 6+2 pin variants is a non issue.
The Corsair is a slightly stronger psu with 52a on the 12v rails vs. 46.
Both are good quality. Take your pick.
It will destroy that OCZ 700w in a heartbeat. Specially if you will xfire in the future.
Btw they both have dual 6 pin connectors. Its just that the OCZ has shorter cables and it is not as stable as the 650TX....
With a single 12v Rail @ 52a you will be able to power up to 2x 4850's in xfire, not sure if it will power dual 4870's but if you see a reviewer on Newegg that is using dual 4870's then you are good to go..If not then go with the 750TX @ 119.99$
Above is power calculator. You can calculate base on your current and future loads. You stated you are considering crossfire.
All good Power Supply Brand provide 6 and 8 pin GPU power connector. Thats the last thing you should worry.
True, the calculator works fine to get all load info, but he needs a power supply to power a 955BE rig that will run dual 4870's in xfire. That said, with the 750TX he has plenty of power. I build and I use Corsair, Antec and Thermaltake PSU's so as far as his budget goes, there is no better PSU then the 750TX for its price. If there was a lil more cash involved then it would be another story.
Crossfired 4870's only need about 20 - 22 amps for the video cards. A 650TX has plenty of capacity. More worrisome, though, is the lack of PCI power connectors. Like geofelt, I would rather not use adapters.