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Want to go crossfire, dont know if my PSU is enough

  • Power Supplies
  • Crossfire
  • Components
Last response: in Components
May 28, 2011 8:47:51 PM

I want to get another 4870 1gb but i dont know if my 750W PSU can take it.

Specs: Intel core i 7 920 oc'd to 3.16ghz
6 gb ddr3 RAM
ATI Radeon 4870 1gb
1 terabyte 7200rpm harddrive

More about : crossfire dont psu

a b ) Power supply
May 28, 2011 8:49:07 PM

Hello! Welcome!
no specs?
a c 91 ) Power supply
May 29, 2011 1:21:52 AM

Please give the exact PSU model.. Though generally, even a good 650W model PSU can handle a pair of 4870's and an overclocked i7 with ease..
Related resources
May 29, 2011 10:53:20 AM

My current spec is:
i5 2500k @ 4.6Ghz
Asus P8P67 Pro R3 Mobo
8GB Corsair Vengeance RAM 7-8-7-24 1T @1600Mhz
2 x 2GB MSI 6950 X-Fire
Asus Xonar DS SoundCard
2 x Intel X25-M 80GB RAID 0
OCZ Stealth Xtreme 750W PSU
Corsair H70 Cooler
NZXT Digital Fan Controller controlling 5 120mm fans
Win 7 64bit Premium
Antec 1200 Case 3 120mm fans and 1 200mm fan
DVD rw drive

My 750w ocz psu runs everything fine although it does heat up while playing bad company 2 and the fan noise increases on the psu. So far ive had no problems.
a c 252 ) Power supply
May 29, 2011 2:06:45 PM

500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)

As you can see above, ATI says ya need a 600 watter. You may want to run OCCT's CPU and PSU tests to see if you are seeing any voltage anomalies. The ATX spec is 5%, but with twin cards and OC'ing, I look for no more than 1% voltage variation in order to maintain the voltage stability necessary for high OC's..

The OCZ "Stream" series was not very good.....the GameXtreme gets a 7.5 performance rating here:

If you get worried about the excess heat and noise is bothersome, Antec makes a hi end PSU series specifically for the 1200 and 3 other performance oriented cases (P183, P192, DF-85). Jonnyguru says:

[The CP-850] is completely unmatched by any ATX unit on the market I can think of. You'd have to spend twice as much as this thing costs to find the next best thing, performance wise.

For a detailed review of the Antec 1200 / CP-850 combo, read the conclusions here: