Bitcoin Forum
December 04, 2016, 06:32:12 PM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Power for two 5850  (Read 4530 times)
swissmate
Sr. Member
****
Offline Offline

Activity: 252



View Profile
May 20, 2012, 07:23:59 PM
 #1

So I'm expanding my rig with a new 5850.
Will my PSU(600 watts and 3 years old) give enough energy for two 5850?

Computer specs:
Intel Quad Core 2.4Ghz
4Gb Ram
2 HDD
2 Amd Sapphire 5850
Psu 600 watts

Bitcoin adress:1HtrosDCEM3zMJ1RbsK9g4vpe3DTotBhVh


Need any translation?
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1480876332
Hero Member
*
Offline Offline

Posts: 1480876332

View Profile Personal Message (Offline)

Ignore
1480876332
Reply with quote  #2

1480876332
Report to moderator
check_status
Full Member
***
Offline Offline

Activity: 196


Web Dev, Db Admin, Computer Technician


View Profile
May 21, 2012, 04:09:01 AM
 #2

What are the PSU specs; How many rails; what brand; how old is the PSU?
If it is sold on Newegg provide a link.
What motherboard will they be run on?
Do you have a wattage meter like, Kill-A-Watt brand?

In the mean time, here are some helpful articles.

The 5850 has a maximum board power of 151W to 179W, depending on model.
http://www.guru3d.com/article/radeon-hd-5850-review-crossfire/2

Quote
Energy consumption

We'll now show you some tests we have done on overall power consumption of the PC. Looking at it from a performance versus wattage point of view, the power consumption is pretty good for a product of this caliber, according to ATI the 5850 has a TDP of 151 Watts.

....

Keep that in mind. Our normal system power consumption is much higher than your average system.

    System in IDLE = 168 Watts
    System with GPU in FULL Stress = 348 Watts
    (5850 consumption = 180 Watts)

Recommended Power Supply

So here's my power supply recommendation:

Radeon HD 5850

    The card requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 40 Amps available on the +12 volts rails.

Radeon HD 5850 CrossfireX

    A second card requires you to add another 170 Watts. You need a 650+ Watt power supply unit if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 55~60 Amps available on the +12 volts rails. 

For each card that you add, add another 200 Watts as a safety margin.
http://www.guru3d.com/article/radeon-hd-5850-review-crossfire/9

Quote
Single GPU 5850

    System in IDLE = 157 Watts
    System with GPU in FULL Stress = 334 Watts
    Difference (GPU load) = 184 Watt (official reference TDP = 170W)
http://www.guru3d.com/article/his-radeon-5850-icooler-v-turbo-review/6

Both models did draw 180 Watts+, but in mining power consumption can be less depending on how you clock your cards so working with a wattage meter will provide much better info.

For Bitcoin to be a true global currency the value of BTC needs always to rise.
If BTC became the global currency & money supply = 100 Trillion then ⊅1.00 BTC = $4,761,904.76.
P2Pool Server List | How To's and Guides Mega List |  1EndfedSryGUZK9sPrdvxHntYzv2EBexGA
swissmate
Sr. Member
****
Offline Offline

Activity: 252



View Profile
May 21, 2012, 11:17:08 AM
 #3

thanks for the info.
i'm not sure which model it is but the motherboard is an asus p5k SE
i'll try them both with that psu and if it seems not stable ill be getting one with higher wattage.

Bitcoin adress:1HtrosDCEM3zMJ1RbsK9g4vpe3DTotBhVh


Need any translation?
gyverlb
Hero Member
*****
Offline Offline

Activity: 896



View Profile
May 21, 2012, 03:05:01 PM
 #4

You'll probably be fine using 150MHz for the memory clock, 1V for the GPUs instead of 1.088V and between 800 and 850MHz for the GPUs' clock.
With a 80+ silver PSU at near peak efficiency my 5850s with such configuration add around 100W to my rig (real power draw at the wall socket) so should use ~90W from the PSU.

At stock voltage, 150MHz memory, ~930MHz they draw ~125W at the wall socket here. So it should be fine too but might not be as profitable (depends on your kWh cost, PSU efficiency, ...).

P2pool tuning guide
Trade BTC for €/$ at bitcoin.de (referral), it's cheaper and faster (acts as escrow and lets the buyers do bank transfers).
Tip: 17bdPfKXXvr7zETKRkPG14dEjfgBt5k2dd
swissmate
Sr. Member
****
Offline Offline

Activity: 252



View Profile
May 21, 2012, 08:48:20 PM
 #5

You'll probably be fine using 150MHz for the memory clock, 1V for the GPUs instead of 1.088V and between 800 and 850MHz for the GPUs' clock.
With a 80+ silver PSU at near peak efficiency my 5850s with such configuration add around 100W to my rig (real power draw at the wall socket) so should use ~90W from the PSU.

At stock voltage, 150MHz memory, ~930MHz they draw ~125W at the wall socket here. So it should be fine too but might not be as profitable (depends on your kWh cost, PSU efficiency, ...).

Those values seem very nice for me
Thanks

Bitcoin adress:1HtrosDCEM3zMJ1RbsK9g4vpe3DTotBhVh


Need any translation?
David_Benz
Donator
Jr. Member
*
Offline Offline

Activity: 56

you got hacked bitch!


View Profile
May 22, 2012, 08:43:02 AM
 #6

Should be fine bro.

They take about 150watts each and if you run them at stock voltage, 840/300 you will get a good 350mhash and 600w PSU should do fine.  But you will wear it out soon.

I am the Bitcoinica Hacker.
swissmate
Sr. Member
****
Offline Offline

Activity: 252



View Profile
May 31, 2012, 12:09:06 PM
 #7

I'm afraid to tell that it's not enough wattage for the two 5850 Sad

Bitcoin adress:1HtrosDCEM3zMJ1RbsK9g4vpe3DTotBhVh


Need any translation?
Dargo
Legendary
*
Offline Offline

Activity: 1554



View Profile
May 31, 2012, 03:27:33 PM
 #8

I'm afraid to tell that it's not enough wattage for the two 5850 Sad

Bummer - but you can undervolt your cards for right now until you get another PSU. 5850s undervolt very nicely. At 0.95, mine pull about 90w and I can get a bit over 300 Mh/s. They are easy to undervolt with cgminer (in both linux and windows).
ssateneth
Legendary
*
Offline Offline

Activity: 1288



View Profile
June 01, 2012, 02:52:31 AM
 #9

you probably have a multirail card, which is bad and makes it seem like your 600w power supply is only a 300w, because it has power locked to certain places, such as if you have 3 rails, atx connector might be on one rail and cpu power might be on another rail, leaving only one rail left to power all your hard drives and video cards and fans. it would be impossible to use locked-out power from the atx/cpu power unless you spliced the connector physically to allow connecting stuff to it (i.e. voiding your warranty)

swissmate
Sr. Member
****
Offline Offline

Activity: 252



View Profile
June 02, 2012, 10:31:09 AM
 #10

Thanks for the info
Didn't really know about that "multirail" problem Sad

Bitcoin adress:1HtrosDCEM3zMJ1RbsK9g4vpe3DTotBhVh


Need any translation?
aqrulesms
Sr. Member
****
Offline Offline

Activity: 265


Cryptocurrency trading and mining


View Profile
June 03, 2012, 04:43:48 PM
 #11

Thanks for the info
Didn't really know about that "multirail" problem Sad

http://www.newegg.com/Product/Product.aspx?Item=N82E16817171053&Tpk=cooler%20master%20750w

That should suffice your needs.

I have that exact same PSU and it can run a 7970 that pulls 250w at stock and the 150.  At the same time I have a pretty expensive CPU since this used to be my gaming PC, yet it provides enough power to everything.
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!