7950 Crossfire power draw?

[almighty15]

Ordered another MSI Twin Frozr 3 7950 Boost Edition yesturday as OCUK decided to drop them down to a stupidly low price!!

And this morning I realised my PSU might not be up to running them.

It's a BeQuiet 630w Bronze Rated unit.

My current system is...

2500k @ 4.8Ghz with 1.4v
MSI Z68 mATX motherboard
8Gb RAM
1x MSI Twin Frozr 3 7950 Boost Edition at 1150Mhz core
2x Samsung F5 HDD's in RAID 0
1x Kingston 120Gb SSD
2x Antec Kuler 920's
7x Arctic Cooling F12 fans.

 

[Neutronstar1989]

I believe a 7950 without +% power will draw 130-150watts, a +20% 7950 will draw ~200

I don't think you'll be able to power 2, especially boost editions, they run @ 1.25v and I'm assuming @ 1150mhz you're running +20% power. If I had the spare money to buy another 7950 though I would, if it doesnt power on, then hold it aside while you buy a 800watt PSU

 

[RJC]

You would probably pull in the region of 500w if your system was running crossfire.

Is this your PSU:

http://www.kitguru.net/components/p...iet-pure-power-l8-630w-power-supply-review/2/

It has enough connections to run crossfire without the need for molex adapters.

 

[spixelspixel]

I'm going to assume its the pure power l8 630w you have?

In my opinion it will run them fine. You will be getting close to its max output but the worst that can happen is the psu's safety features kick in and switch it off.

The psu has 2x6pin pci and 2x8pin so you don't have to mess around with adapters. If you did then I wouldn't recommend it.

I'd also recommend getting one of those cheap plugin power meters which will show you how much the system is drawing from the wall. I think you'll be surprised how low it is. If it shows 600w or under when stressing both gpu's + cpu at the same time then your fine (The psu has 564w on the 12v rail but wall readings don't take efficiency into account... 600w@84% efficiency = 504w real wattage being used)

 

[OLDPHART]

Just checked a review they recommend at least a 700w, you might get away with it but any problems chance's are you need a bigger Psu.

 

[spixelspixel]

Just checked a review they recommend at least a 700w, you might get away with it but any problems chance's are you need a bigger Psu.

Guru3d review of the gtx 670 recommends 550w for a single card. I ran one with a 2500k on a 400w and the whole system never used more than 220w

 

[RJC]

I only got 330w from the mains with system in my sig.

BeQuiet is a quality brand unit.

 

[almighty15]

I believe a 7950 without +% power will draw 130-150watts, a +20% 7950 will draw ~200

I don't think you'll be able to power 2, especially boost editions, they run @ 1.25v and I'm assuming @ 1150mhz you're running +20% power. If I had the spare money to buy another 7950 though I would, if it doesnt power on, then hold it aside while you buy a 800watt PSU

My current boost edition only has 1.18v stock voltage.

Its based on the 7970 reference PCB though, the original boost edition I had went faulty and that card was the cot down PCB and had a voltage of 1.25v

 

[almighty15]

I believe a 7950 without +% power will draw 130-150watts, a +20% 7950 will draw ~200

I don't think you'll be able to power 2, especially boost editions, they run @ 1.25v and I'm assuming @ 1150mhz you're running +20% power. If I had the spare money to buy another 7950 though I would, if it doesnt power on, then hold it aside while you buy a 800watt PSU

My current boost edition only has 1.18v stock voltage.

Its based on the 7970 reference PCB though, the original boost edition I had went faulty and that card was the cut down PCB version and had a voltage of 1.25v