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Title: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 30, 2011, 08:39:49 PM 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 Title: Re: bottle necking my cpu? or what else may be wrong? Post by: bmgjet on July 30, 2011, 10:51:07 PM That cpu should be fine for a few Ghash/s since its the gpu that does all the work.
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: k9quaint on July 30, 2011, 11:23:10 PM 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. Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 30, 2011, 11:39:13 PM 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?
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: k9quaint on July 31, 2011, 12:01:32 AM Uninstall and reinstall is the recommended method.
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 31, 2011, 12:10:59 AM ok... kwl... im trying that now
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 31, 2011, 12:20:04 AM 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
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 31, 2011, 01:14:37 AM 11.7 has an even worse effect... on willnow run at around 270 wile the others run below 10 :o... what drivers are you guys using?
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: drawoc on July 31, 2011, 01:43:08 AM Just to be sure, do you have dummy plugs on the extra cards? (Windows needs them, Linux doesn't)
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 31, 2011, 02:03:40 AM yes i do
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 31, 2011, 05:17:39 PM 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
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on July 31, 2011, 05:51:30 PM all i have running in the background is task manager... and with it closed or open, there is not difference in MHash/s
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on August 01, 2011, 04:04:35 AM bump again... whats the best driver for mining with 5870s?
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on August 02, 2011, 11:53:53 PM 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 :P)
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: Beta-coiner1 on August 03, 2011, 04:52:42 AM 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 :P) 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. Title: Re: bottle necking my cpu? or what else may be wrong? Post by: PLaci1982 on August 03, 2011, 08:52:41 AM If there are mounting places in your case for fans put as much possible in!
I did put in 1x 80mm (http://www.noctua.at/main.php?show=productview&products_id=9&lng=en), 1x 90mm (http://www.noctua.at/main.php?show=productview&products_id=16&lng=en) Noctua coolers, and my 100-105°C cards with max ~75% load dropped to 75-85°C at 100% load! Title: Re: bottle necking my cpu? or what else may be wrong? Post by: SMOKEU on August 03, 2011, 09:29:21 AM 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.
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: PLaci1982 on August 03, 2011, 10:42:03 AM 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 (https://bitcointalk.org/index.php?topic=33613.0) Title: Re: bottle necking my cpu? or what else may be wrong? Post by: gtrrkicw on August 03, 2011, 02:50:28 PM 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.
Title: Re: bottle necking my cpu? or what else may be wrong? Post by: Dargo on August 03, 2011, 03:16:49 PM 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 :P) Have you considered going caseless? From what I have read, it's going to be tough keeping 3x5870s cool in a case, especially if they are close together. I have enough trouble with my 2x5850s in a case, and will be going caseless soon. I know, if they are in your room, you don't want a caseless mess, but it may be the best way to keep the cards cool. If you are handy with tools, I think it isn't that hard to build an open air case that is relatively tidy. I've built an aluminum frame that I might cover with some mesh screen, and I think the end result will look OK. Title: Re: bottle necking my cpu? or what else may be wrong? Post by: Beta-coiner1 on August 03, 2011, 05:45:35 PM 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. It's the Catalyst 11.7 Whql...The 11.6B should fix the issue.There is no need to uninstall the 2.5 APP runtime it is just the Video driver not the OpenCL variant.Title: Re: bottle necking my cpu? or what else may be wrong? Post by: eskamobob1 on August 04, 2011, 07:40:31 PM I have been thinking about going case less for a wile... And I have the woodworking experience to make a simple tech bench... I think I will do that for now if I can't find some cheap one online... I don't particualy want to replace the thermal compound (though I know how) because I don't want to void the warranty if i don't have to... Also, would you guys recommend getting PCI-E extenders and spacing out the cards and adding two more if I will be building a custome case anyways?
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