Crossfire???

[bvsbutthd101]

My friend just bought a new budget rig,
My question is will the powersupply he got be able to handle 2 6850's
or 2 6870's. If it can handle it, will the cpu bottleneck

this is the motherboard he got
Newegg.com - GIGABYTE GA-H55M-UD2H LGA 1156 Intel H55 HDMI Micro ATX Intel Motherboard

CPU
Newegg.com - Intel Core i5-750 Lynnfield 2.66GHz 8MB L3 Cache LGA 1156 95W Quad-Core Processor BX80605I5750

Powersupply
Newegg.com - COOLER MASTER eXtreme Power Plus RS700-PCAAE3-US 700W ATX 12V v2.3 Active PFC Power Supply

[_dangtx_]

not quite sure who the oem is, ul lookup just lists cm : QQGQ8.E320127 - Power Supplies, Information Technology Equipment Including Electrical Business Equipment Certified for Canada - Component

but if it can do the specified numbers? why not.

6 series are quite nice on the juice demands :)


cpu will be fine.

[bvsbutthd101]

he's not getting 2 cards right away, starting off with one, just wanted to make sure the PSU could handle 2, so it's a ok on crossfire right?

[_dangtx_]

should be ok.

[Arinoth]

He should be able to. I am running a 750W Corsair PSU with an i7 940 overclocked to 3.8GHz and with 2 470s i didnt come close to over running my power supply. I've since switched to crossfire 6870s and i believe they use considerably less amount of power then the 470s. Also the i7 1366s use more power then the i5 1156.

If you want i can within the next few days see what my kill a watt meter says it uses during gaming or benchmarking

[bvsbutthd101]

OK, thanks, he'll be happy to know that :)

[Soultribunal]

I personally wouldn't go above the 6850's on that particular unit. Coolmaster PSU's are...ok...but the OEM they choose is less than ideal. I think the Extreme's were Seventeams low end units. I'm never a fan of pushing a PSU that is less than ideal.

ST

[dustin1706]

I agree with ST in that the PSU is not a high quality unit.

That being said, 700 watts is lots for that system.

Pulling power from my system: i7 930 @ 4.0 | 2x 5870 @ 1000 / 1350 | GTS 450 for physx | 2 HDDs, 2 SSDs, 2 water pumps, fans

According to my kill-a-watt, I am drawing 220w at idle and right around 600w with 100% CPU and GPU load. This is from the wall. Even if my PSU was at it's maximum efficiency of 86%, then my system is actually maxing out at 516w on the DC side.

[Soultribunal]

Originally Posted by dustin1706

I agree with ST in that the PSU is not a high quality unit.

That being said, 700 watts is lots for that system.

Pulling power from my system: i7 930 @ 4.0 | 2x 5870 @ 1000 / 1350 | GTS 450 for physx | 2 HDDs, 2 SSDs, 2 water pumps, fans

According to my kill-a-watt, I am drawing 220w at idle and right around 600w with 100% CPU and GPU load. This is from the wall. Even if my PSU was at it's maximum efficiency of 86%, then my system is actually maxing out at 516w on the DC side.

Oh I know 700W is overkill in the traditional sense. But I wouldn't but 100W on a questionable unit. Where as my HX650 I put 85% load right now on the AC side and its quite content.

ST

[Dr_BenD_over]

Not the greatest board for Crossfire seeing as it's x16/x4 (and it looks like the x4 isn't 2.0 even)