How far can you push a GPU | Bitcointalksearch.org

Omni

newbie

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Quote from: kliffen on March 03, 2012, 07:34:29 AM

Quote from: Kluge on March 02, 2012, 08:16:28 PM

Quote from: flip on March 02, 2012, 04:00:33 PM

As with sex, mining is not done "best" at the fastest speed.

Woman alert.

Oh god my sides.

But he's right, pushing your GPU to the maximum possible before everything BSoDs or just crashes is NOT an effective way to mine. It's better to keep it stable. Uptime is key

Stamina is everything she always said.

BlueCorp

newbie

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The OS you're running also affects the OC on the GPU

check_status

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Web Dev, Db Admin, Computer Technician

Yes, there are a few. Some have made decent tests on 5850's and 5870's to find the sweet spot for lower energy usage while not compromising hashrate.
For 5870 I remember 1000/210 and 950/210 as one sweet spot for some. Basically make adjustments on either the core or memory until you get invalids then back off, modify the other until same, back off slightly. This would be the maximum you can OC/UC. Also, OC/UC depends a lot on which OS you are running, how that will be achieved.

BlueCorp

newbie

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Isn't there a table showing how far to push them?

Red Emerald

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Quote from: mike029 on March 03, 2012, 09:15:04 PM

Just started mining and have my two 5870's running at 900/600 with temps at 71. Not looking to push them too much. Wink

Any reason you stopped at 600? My best hashrate is when the mem clocks are at ~~290~~ 280.

malevolent

legendary

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Quote from: mike029 on March 03, 2012, 09:15:04 PM

Just started mining and have my two 5870's running at 900/600 with temps at 71. Not looking to push them too much. Wink

Im running mine @ 1005/320 with same temp and fan at 65%. Stock voltage, you could try at least 970/350

Graet

vip

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Re: How far can you push a GPU
about 50meters till my back gives in, card gets pretty scratched up too
<.<
>.>
Grin

mike029

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Just started mining and have my two 5870's running at 900/600 with temps at 71. Not looking to push them too much. Wink

TheOriginalMyth

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Thanks for all the input, i realize the 6870 isn't the best card for mining, im just using the card i had in my system to see how mining works. My title might have bee a little misleading, i was not really asking how far i can push the card i was more wondering if a temp of 85 was too hot (and the consensus seems to be that i should keep it a tad cooler). Im now messing around with the mem clock to see if i can get it a bit cooler/ faster, ill post a update in a little while.

oxydius

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I've hit 1000Mhz core on a Radeon 6870, but it gets a bit hot in a packed CrossFire setup.

When you're mining Bitcoins you can drop the memory clock to 300Mhz, it'll let the core use more of the available power (PowerTune) and perform better with less watts.

Miner612

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Activity: 84

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FPGA convert

I over clock the HELL out of some of my cards. Been able to get 425-430 mhash range on a reference 5850.

1225 voltage
1040 core
300 ram
60 fan speed

stays at about 70 degrees but I have them in my cold garage. I get nervous when any of my GPUs get over 75.

xminer

jr. member

Activity: 73

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Using Ati tray tools ( www.guru3d.com ) in windows, cgminer in linux to set OC for 5870 cards.

Best results are when your mem freq is exactly 1/4, (maybe, 1/3), or 1/2 (if you're gaming on the same card) of GPU frequency - if it's a little higher things seem to go out of sync and you may loose some MH/s due to async operation.
mining at 920/[email protected], 880/220 mem (winter has ended Sad

- downclocked to reduce heat), 700/[email protected] and 716/[email protected] (that's for low noise setup)

Gabi

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If you want to walk on water, get out of the boat

Quote from: TheOriginalMyth on March 01, 2012, 05:54:11 PM

Alright, how would i go about dropping the mem speeds, in control center i am only able to increase the speed from 1050-1250 (no option to lower it)

Also what temp should i be shooting for, i know the lower the better but what kind of realistic temps should i be trying to get, 75, 70, 65?

Use MSI Afterburner

75 is fine

malevolent

legendary

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Quote from: flip on March 02, 2012, 04:00:33 PM

As with sex, mining is not done "best" at the fastest speed.

Overvolting uses considerably more power and makes any extra MH/s gained wasted because it cost you considerably more in electricity to get them. Not to mention the additional heat, noise, and wear and tear on your rig. The 6870 is also a terrible mining card (loud, hot, and slow). Sell it on eBay and buy a 5870. You will not regret it.

FTFY

kliffen

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Quote from: Kluge on March 02, 2012, 08:16:28 PM

Quote from: flip on March 02, 2012, 04:00:33 PM

As with sex, mining is not done "best" at the fastest speed.

Woman alert.

Oh god my sides.

But he's right, pushing your GPU to the maximum possible before everything BSoDs or just crashes is NOT an effective way to mine. It's better to keep it stable. Uptime is key

Kluge

donator

Activity: 1218

Merit: 1015

Quote from: flip on March 02, 2012, 04:00:33 PM

As with sex, mining is not done "best" at the fastest speed.

Woman alert.

flip

newbie

Activity: 12

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As with sex, mining is not done "best" at the fastest speed.

TheOriginalMyth

newbie

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Alright, how would i go about dropping the mem speeds, in control center i am only able to increase the speed from 1050-1250 (no option to lower it)

Also what temp should i be shooting for, i know the lower the better but what kind of realistic temps should i be trying to get, 75, 70, 65?

Kluge

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Activity: 1218

Merit: 1015

Quote from: TheOriginalMyth on March 01, 2012, 05:37:27 PM

Quote from: Kluge on March 01, 2012, 05:31:17 PM

They will deteriorate at any temperature. They will deteriorate faster when hotter and when running @ a higher voltage.

Your temps are not unreasonably high, but I think many would start feeling a bit uncomfortable at those temps.

Thanks for the reply, it seems like one section of the GPU is always higher than the other parts (temp #2) any idea as to why that is happening?

Im also looking into adding another fan to my case as i only have 2 fans in the case atm.

They are measuring three different points in the GPU. It's measuring at three different key locations on the card. Beyond that, figuring out which sensor # goes to which part probably varies with manufacturer and architecture -- might be able to find it in the owner's manual? DeathAndTaxes might know -- he seems to know everything.

ETA: and yes, dropping mem speeds will decrease heat without impacting mining performance. Don't drop it below 300MHz. Sometimes, lowering mem speeds also increases mining performance a minor amount. If you're gaming, though, you won't want your mem speed underclocked so dramatically.

TheOriginalMyth

newbie

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Quote from: Red Emerald on March 01, 2012, 05:39:13 PM

Any reason you haven't dropped your memory clock?

Let me emphasize the oooo of my Noobness, i assume from your comment thought that dropping the memory clock will improve performance/ decrease heat?

Topic: How far can you push a GPU (Read 2043 times)