6870 and 5970 on 750 Watt PSU? | Bitcointalksearch.org

humanage

member

Activity: 64

Merit: 10

Quote from: jake262144 on February 20, 2012, 07:19:01 PM

Provided you don't waste power by e.g. by CPU mining Litecoins, easily.
A 5970 shouldn't pull more than 250 W with its memory underclocked.
With 120 W for the rest of the system, the PSU load would be 82,7% - not unreasonable for a high quality PSU such as the ZT 750W.

Make sure that the CPU power save options (such as SpeedStep or C1E) are enabled in the BIOS.

Okay, so I got my 2nd 5970 today, running both @ 820MHz Core/300MHz Memory with the CPU having power savings enabled. No problem with my OCZ ZT 750 Watt handling this, getting 1400mh/s.
Cheesy

jake262144

full member

Activity: 210

Merit: 100

Provided you don't waste power by e.g. by CPU mining Litecoins, easily.
A 5970 shouldn't pull more than 250 W with its memory underclocked.
With 120 W for the rest of the system, the PSU load would be 82,7% - not unreasonable for a high quality PSU such as the ZT 750W.

Make sure that the CPU power save options (such as SpeedStep or C1E) are enabled in the BIOS.

humanage

member

Activity: 64

Merit: 10

Self bump. Would my OCZ 750w actually be able to push 2x 5970s at 820MHz Core/300MHz memory? Just confirming.

humanage

member

Activity: 64

Merit: 10

Quote from: joshv06 on February 18, 2012, 10:51:02 PM

Just get a KW PSU Shocked

I'm sorta on a tight budget. :/

Quote

Should be fine. Unless its like a 6 rail PSU lol

I think it's a single rail. Cheesy

Miner612

member

Activity: 84

Merit: 10

FPGA convert

Should be fine. Unless its like a 6 rail PSU lol

joshv06

hero member

Activity: 991

Merit: 500

Just get a KW PSU Shocked

humanage

member

Activity: 64

Merit: 10

Quote from: check_status on February 09, 2012, 01:32:25 PM

@humanage What motherboard do you have?

MSI P67A-G43, sorry for that late response, didn't get a notification for this message.

Edit: Also, I'll only be using a Pentium G620 with 4GB of DDR3 on the mining rig. I'm not sure if that would still be able to pull 2x 6870s running at 820MHz Core/300MHz Memory. :/ Anyone try on the OCZ ZT 750 Watt PSU? I'm currently running a single HD 5970 with an Accellero Extreme cooler.

check_status

full member

Activity: 196

Merit: 100

Web Dev, Db Admin, Computer Technician

@humanage What motherboard do you have?

humanage

member

Activity: 64

Merit: 10

Quote from: ?? on ??

Easily.

Quote from: someone703 on February 07, 2012, 12:56:36 PM

I'm currently running 1 5970 overclocked a little on my only computer (i7-920, got an SSD, 5 hard drivers, 6 sticks of RAM, and like 6 case fans - not exactly energy efficient like some dedicated mining rigs people here have) and Kill-a-watt shows me pulling about 460w max or so while mining.

Site I checked says the 6870s pull about 150w so with a 750 you should have a little headroom still after getting your 5970.

That's definitely good to here! Cheesy

Also, I'll look around for a Kill-a-watt.

someone703

full member

Activity: 944

Merit: 101

PredX - AI-Powered Prediction Market

I'm currently running 1 5970 overclocked a little on my only computer (i7-920, got an SSD, 5 hard driver, 6 sticks of RAM, and like 6 case fans - not exactly energy efficient like some dedicated mining rigs people here have) and Kill-a-watt shows me pulling about 460w max or so while mining.

Site I checked says the 6870s pull about 150w so with a 750 you should have a little headroom still after getting your 5970.

Avid6eek

newbie

Activity: 7

Merit: 0

You shouldn't have an issue. Do you own a Kill-a-watt unit (http://www.newegg.com/Product/Product.aspx?Item=N82E16882715001)? If not I would suggest purchasing one. It makes tweaking your system to draw less power much easier.

I have 3 x unlocked 6950's generating 1050 Mhash/sec and the whole system is drawing 460w.

humanage

member

Activity: 64

Merit: 10

I'm currently running 2 overclocked 6870s on an 1155 Pentium G620 system. I'm using an OCZ ZT 750 Watt power supply. I'm buying a 5970 this week, and I'm worried that my power supply won't support it. So would the OCZ PSU support 1 6870 OC & 1 5970 OC(selling 1 6870 due to the fact that my mobo only has 2 slots for GPUs)?

Topic: 6870 and 5970 on 750 Watt PSU? (Read 1984 times)