Bitcoin Forum
December 11, 2016, 02:18:25 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: Hash rate swinging a lot  (Read 1310 times)
iLLmAtiCiAn
Jr. Member
*
Offline Offline

Activity: 54


View Profile
September 11, 2011, 02:49:07 PM
 #1

Hey guys, I have two miners where the hash rates stay mostly constant but on one miner the hash rate changes a lot. Gpu utilization keeps going from like 99% to like 80% and all the way in between.
1481465905
Hero Member
*
Offline Offline

Posts: 1481465905

View Profile Personal Message (Offline)

Ignore
1481465905
Reply with quote  #2

1481465905
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1481465905
Hero Member
*
Offline Offline

Posts: 1481465905

View Profile Personal Message (Offline)

Ignore
1481465905
Reply with quote  #2

1481465905
Report to moderator
1481465905
Hero Member
*
Offline Offline

Posts: 1481465905

View Profile Personal Message (Offline)

Ignore
1481465905
Reply with quote  #2

1481465905
Report to moderator
1481465905
Hero Member
*
Offline Offline

Posts: 1481465905

View Profile Personal Message (Offline)

Ignore
1481465905
Reply with quote  #2

1481465905
Report to moderator
Bitcraft
Jr. Member
*
Offline Offline

Activity: 56



View Profile
September 12, 2011, 01:45:25 PM
 #2

Might be a weak power supply. What are the specs (all of them) for your rig?
iLLmAtiCiAn
Jr. Member
*
Offline Offline

Activity: 54


View Profile
September 13, 2011, 06:22:34 AM
 #3

I don't think it's the power supply unless it's faulty. I have a hx850 powering a 5870 and a 5850 with an amd sempron + 1gb ddr3 ram stick
iLLmAtiCiAn
Jr. Member
*
Offline Offline

Activity: 54


View Profile
September 13, 2011, 06:23:04 AM
 #4

I mean i have an elitexstream 800w powering 3x 5850 just fine on my other rig
iopq
Hero Member
*****
Offline Offline

Activity: 644


View Profile
September 13, 2011, 08:06:04 AM
 #5

what miner are you using? What is the temperature like on the cards?

iLLmAtiCiAn
Jr. Member
*
Offline Offline

Activity: 54


View Profile
September 13, 2011, 02:29:12 PM
 #6

using guiminer opencl, temperature looks fine, it's 78-80 max on 5850 and below 70 max on 5870
RyNinDaCleM
Legendary
*
Offline Offline

Activity: 2002


Legen -wait for it- dary


View Profile
September 14, 2011, 04:06:14 PM
 #7

In GUIminer, What flags do you use?

turquoise9955
Newbie
*
Offline Offline

Activity: 14


View Profile
September 17, 2011, 09:36:06 AM
 #8

using guiminer opencl, temperature looks fine, it's 78-80 max on 5850 and below 70 max on 5870
Could still be wrong though
DeathAndTaxes
Donator
Legendary
*
Offline Offline

Activity: 1218


Gerald Davis


View Profile
September 27, 2011, 08:59:19 PM
 #9

Check VRM temps.  When load varies like that it could be thermal throttling due to overheating VRM.

A utility like GPU-Z will show you VRM temps.  Note something which only shows a single temp isn't useful.  There are 8 different temps on each graphics card (12 if you have dual GPU card).  The VRM temp (called VDDC in GPU-Z is the one to look at.
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!