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Which PSU is better for the price?

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July 10, 2009 8:50:14 PM

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.

CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This one is 90, but has 2 6+2 pins.

More about : psu price

a c 126 ) Power supply
July 10, 2009 9:19:51 PM

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.

But... crossfire 4870 wants 4 6-pin psu connectors which neither psu has.
http://www.amd.com/us/products/desktop/graphics/ati-rad...

You could use molex to pci-e adapters because the psu's are strong enough. But I hate to do that.

I think by the time you want crossfire, there will be stronger and cheaper cards available.
a b ) Power supply
July 10, 2009 9:23:30 PM

Get the Corsair 650TX <--- Rated BEST 650w PSU

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$

Hope this helps....
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July 10, 2009 9:27:07 PM

It would falter on 2x 4870s?

edit: I misread the first post. I wouldn't have the connectors. Got it.
a b ) Power supply
July 10, 2009 9:50:21 PM

Ok looks like the 650w is a no-show....You need more power as far as the dual 4870's...

If you can save up for the 750TX then go with that. You wont have any issues xfiring dual 4870's....
a b ) Power supply
July 10, 2009 9:53:00 PM

http://www.antec.outervision.com/

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.
a b ) Power supply
July 10, 2009 11:56:32 PM

leon2006 said:
http://www.antec.outervision.com/

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.
a c 144 ) Power supply
July 11, 2009 7:05:52 PM

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.
July 11, 2009 8:24:15 PM

I went with the 750tx, because it was only $5 more expensive, after MIR.
a b ) Power supply
July 12, 2009 4:35:54 PM

Good call ^
a b ) Power supply
July 12, 2009 10:46:19 PM

I second that......Your gonna love that PSU......
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