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Author Topic: bottle necking my cpu? or what else may be wrong?  (Read 1512 times)
eskamobob1
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July 30, 2011, 08:39:49 PM
 #1

hey guys,

i have recently upgraded to 3x 5870 in my mining rig, how ever, when i run all three, one will run at around 270MHash/s, and the other two will be below 100 MHash/s... when i run just one it runs at right around 300, but even with a 150MHz OC it wont go above 320... i was wondering if i am possibly bottle necking my CPU as it is prity old, or if something else may be going wrong

my system specs are:

CPU: pentium d 840 (3.2GHz)
Mobo: 780i ultra
RAM: 4x1GB bargain brand PC2-4200
CPU cooler: h70
case: HAF X (full fans)
GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4

any thoughts are welcomed

thank you in advance

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My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
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bmgjet
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July 30, 2011, 10:51:07 PM
 #2

That cpu should be fine for a few Ghash/s since its the gpu that does all the work.

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July 30, 2011, 11:23:10 PM
 #3

The probably is most likely with your drivers. I had a 2 core CPU maxed out at 100% just running 2 GPUs due to a bug in the catalyst drivers. Which OS and driver version are you running?

I have 11.6 Catalyst + Linux working with <10% CPU util.

11.7 Catalyst showed the same symptoms you see.

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eskamobob1
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July 30, 2011, 11:39:13 PM
 #4

i have 11.7 and im running windows XP... im planning on going linux as soon as i can make this a dedicated machine... how would i go about downgrading to 11.6... is there a simpler way than fully un installing and re installing the drivers?

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My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
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July 31, 2011, 12:01:32 AM
 #5

Uninstall and reinstall is the recommended method.

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eskamobob1
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July 31, 2011, 12:10:59 AM
 #6

ok... kwl... im trying that now

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
eskamobob1
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July 31, 2011, 12:20:04 AM
 #7

i just realized that i am on 11.6... i am about to try 11.7 and hope for the best... plz let me know what drivers you guys had the most success with

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
eskamobob1
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July 31, 2011, 01:14:37 AM
 #8

11.7 has an even worse effect... on willnow run at around 270 wile the others run below 10 Shocked... what drivers are you guys using?

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
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July 31, 2011, 01:43:08 AM
 #9

Just to be sure, do you have dummy plugs on the extra cards? (Windows needs them, Linux doesn't)

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eskamobob1
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July 31, 2011, 02:03:40 AM
 #10

yes i do

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
eskamobob1
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July 31, 2011, 05:17:39 PM
 #11

one more bump... and i am currently testing out 11.5.. it is running better than previous versions, but still only at 450-500MHash/s for 2 cards

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
buttons252
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July 31, 2011, 05:21:53 PM
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do you have any applications running in the background?  My AMD sempron does well except when windows update , antivirus, or anything that takes the CPU attention away from the mining. 
eskamobob1
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July 31, 2011, 05:51:30 PM
 #13

all i have running in the background is task manager... and with it closed or open, there is not difference in MHash/s

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
eskamobob1
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August 01, 2011, 04:04:35 AM
 #14

bump again... whats the best driver for mining with 5870s?

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
eskamobob1
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August 02, 2011, 11:53:53 PM
 #15

Bump... I have figured out why my mhash/s is lowering on my second and 3rd card... They down clock them selves when I turn them on... I can only asume this is because of heat... So what do you guys use to keep your temps down? I hit 100c plus with all three cards on, and the middle and top cards hits 95 when I only have two running (bottom and middle or top is the same result)... Any suggestions are welcome, but my comp is in my room so using 190CFM fans in the GPU duct in the HAF X is not an option (I have tried Tongue)

1HAwtsfF3yzejtqafxChpp6uAGMVHzXW4H

My system:

CPU: pentium d 840        Mobo: 780i ultra
RAM: 4x1GB PC2-4200    CPU cooler: h70
Case: HAF X (full fans)   GPU: 3x gigabyte GV-R587UD-1GD
PSU: 1600W ultra X4      Storage: 2x wd black 1TB/ 80GB samsung/ 500GB WD balck (boot drive)
Beta-coiner1
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August 03, 2011, 04:52:42 AM
 #16

Bump... I have figured out why my mhash/s is lowering on my second and 3rd card... They down clock them selves when I turn them on... I can only asume this is because of heat... So what do you guys use to keep your temps down? I hit 100c plus with all three cards on, and the middle and top cards hits 95 when I only have two running (bottom and middle or top is the same result)... Any suggestions are welcome, but my comp is in my room so using 190CFM fans in the GPU duct in the HAF X is not an option (I have tried Tongue)
Use a good third party thermal compound on your GPUs.It is possibly the cheapest way....but kinda precarious if you don't know where and how to put the goo on.

I have seen temps drop 8-15 C depending on the GPU.

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PLaci1982
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August 03, 2011, 08:52:41 AM
 #17

If there are mounting places in your case for fans put as much possible in!

I did put in 1x 80mm, 1x 90mm Noctua coolers, and my 100-105°C cards with max ~75% load dropped to 75-85°C at 100% load!

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August 03, 2011, 09:29:21 AM
 #18

I got sick of 11.6 because it kept making my computer freeze when I watched videos and mined simultaneously, so I switched to 11.7 and the problem went away, but now my CPU usage is higher.
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August 03, 2011, 10:42:03 AM
 #19

I got sick of 11.6 because it kept making my computer freeze when I watched videos and mined simultaneously, so I switched to 11.7 and the problem went away, but now my CPU usage is higher.
Sad, but all that are know differences between 11.6 and 11.7...
https://bitcointalk.org/index.php?topic=33613.0

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August 03, 2011, 02:50:28 PM
 #20

I have the same issue with my CPU usage being extremely high. I am running a 5770 on an AMD X4 and it uses up a whole core to keep up with the miner. Is this a problem with the Catalyst driver? I really don't know what else it could be.

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