7850/7870 LTC performance | Bitcointalksearch.org

pr0d1gy

hero member

Activity: 658

Merit: 502

Quote from: polymyxa on May 21, 2013, 10:47:40 AM

Hey,

I'm using the gigabyte GV-R787OC-2GD. I bought it from microcenter for 250$. It is very easy to use - compared to my 7970 cards.
Hashrate: 450 kh/s (scrypt)
I run it with 1.1 mV instat of 1.219V (?) (msi afterburner).
CGminer 3.11
I: 19-20
thread currency: 24000
shaders: 1280
enginge: 1080
memclock: 1435
The temperature is usually 68-71C (card is directly above my power supply, but no other card is next to this one)

$250 at micro? return that shit. mine was 209 with a $10 rebate. Tell them to match price, and get difference. or Get it from frys.... (if you can)

iGotSpots

legendary

Activity: 2548

Merit: 1054

CPU Web Mining 🕸️ on webmining.io

Quote from: Yurizhai on April 29, 2013, 10:40:27 PM

Wow thank you so much man. Been struggling forever to get more than 280 hash a sec, your settings are getting me 350!

Wait wait.. no.. I'm getting HW..

--thread-concurrency 8192

Increase the number if you want to, that's just the number I use for my 6950 miners

polymyxa

newbie

Activity: 22

Merit: 0

Hey,

I'm using the gigabyte GV-R787OC-2GD. I bought it from microcenter for 250$. It is very easy to use - compared to my 7970 cards.
Hashrate: 450 kh/s (scrypt)
I run it with 1.1 mV instat of 1.219V (?) (msi afterburner).
CGminer 3.11
I: 19-20
thread currency: 24000
shaders: 1280
enginge: 1080
memclock: 1435
The temperature is usually 68-71C (card is directly above my power supply, but no other card is next to this one)

jayjay2244

member

Activity: 116

Merit: 10

GUIminer sapphire OC edition 2gb i get 320 KH/S with default high settings @ 16 intensity. However OCing without overvaulting i got upto 370

p00chie

member

Activity: 115

Merit: 10

Quote from: zenrog on May 21, 2013, 09:39:02 AM

My friend got 4x 7850 1gb and still have 400 kh/s with 1150/1250, and me with 2gb version just 360 kh/s... o.O

when you get more hashes with lower core clock you have to find the best ratio between core/clock. If you found the sweet spot try to increase both values that you will remain the ratio

zenrog

member

Activity: 229

Merit: 45

My friend got 4x 7850 1gb and still have 400 kh/s with 1150/1250, and me with 2gb version just 360 kh/s... o.O

p00chie

member

Activity: 115

Merit: 10

Quote from: zenrog on May 21, 2013, 09:32:24 AM

1150/1200 - 300 kh/s
1150/1250 - 330 kh/s
1050/1250 - 360 kh/s

thats extremely strange Shocked

got ?

only 1 GB onboard.
Tc should be really high --> i need 12k to get no HW errors.
Intens --> 19
You should not have to increase mem to get better performance.
also the higher the engine clock the better...

zenrog

member

Activity: 229

Merit: 45

1150/1200 - 300 kh/s
1150/1250 - 330 kh/s
1050/1250 - 360 kh/s

p00chie

member

Activity: 115

Merit: 10

Quote from: zenrog on May 21, 2013, 08:32:35 AM

Got 2x msi 7850 2gb oc 1.138 and can't oc engine more than 1150 (stable), best results 360 kh/s with 1050/1250...

That is true. I have the same results.
You have to increase VCore slowly (5 mV steps) --> my cgminer will crash only if something went wrong

you will get around 396 kHs with 1150.

p00chie

member

Activity: 115

Merit: 10

Quote from: Sy on May 21, 2013, 08:28:39 AM

Quote from: p00chie on May 21, 2013, 08:23:30 AM

I don't get it why to buy 7950 cards when these are maybe 30% more efficient.

Finetuned 7950 run at ~650 khs...

yeah even with best results:

250€ 7950 @ 650 = 2,6 kHs per €
130€ 7850 @ 400 = 3,1 kHs per €

7850 20% better performance (and i am not even couting W)

zenrog

member

Activity: 229

Merit: 45

Quote from: p00chie on May 21, 2013, 08:23:30 AM

Quote from: zenrog on May 21, 2013, 07:55:12 AM

Quote from: p00chie on May 21, 2013, 06:36:33 AM

Quote from: Yurizhai on April 29, 2013, 11:42:31 PM

CGminer. 7850's are just a bitch for scrypt - at least in my experience. I get 330 Mhash/sec easy but nothing I do for khash works.

i am running a rig with 6x msi 7850 and i am getting 400kHs at least out of every one. 3 are better so i get around 415 kHs

Bought them cheap for 122€ so it is 2.40 kHs to 2.45 kHs for only 730 €

i have never tested btc though ...

Clocks?

1200 engine, 1225 to 1200 mem (has nearly no impact).
default clocks are 900:1200 (they overclock like a beast).

i had to raise vcore for 2-4% to get 1200mhz stable.
some cards are with 1.21 default vcore, some are 1.138 and one is 1.075.
1.21 is stable @ 1150 (max vcore is 1.225)
1.138 @ 1.184 with 1200 mhz. --> maybe more is possible
1.075 @ 1.09x with 1200 mhz. --> also more possible

oc memory doesn't bring anything to the table. clocking from 1200 to 1225 only brings 1.x kHs more. lol. i am just doing it for christs sake

I don't get it why to buy 7950 cards when these are maybe 30% more efficient.

LN17tbYHiiagVcvXNeayVNz2bcJxo2no4v or
1CxrhPAr166NrQWhmAf7CvUNAxmxFHoSQa

if you liked it

Got 2x msi 7850 2gb oc 1.138 and can't oc engine more than 1150 (stable), best results 360 kh/s with 1050/1250...

Sy

legendary

Activity: 1484

Merit: 1003

Bounty Detective

Quote from: p00chie on May 21, 2013, 08:23:30 AM

I don't get it why to buy 7950 cards when these are maybe 30% more efficient.

Finetuned 7950 run at ~650 khs...

p00chie

member

Activity: 115

Merit: 10

Quote from: zenrog on May 21, 2013, 07:55:12 AM

Quote from: p00chie on May 21, 2013, 06:36:33 AM

Quote from: Yurizhai on April 29, 2013, 11:42:31 PM

CGminer. 7850's are just a bitch for scrypt - at least in my experience. I get 330 Mhash/sec easy but nothing I do for khash works.

i am running a rig with 6x msi 7850 and i am getting 400kHs at least out of every one. 3 are better so i get around 415 kHs

Bought them cheap for 122€ so it is 2.40 kHs to 2.45 kHs for only 730 €

i have never tested btc though ...

Clocks?

1200 engine, 1225 to 1200 mem (has nearly no impact).
default clocks are 900:1200 (they overclock like a beast).

i had to raise vcore for 2-4% to get 1200mhz stable.
some cards are with 1.21 default vcore, some are 1.138 and one is 1.075.
1.21 is stable @ 1150 (max vcore is 1.225)
1.138 @ 1.184 with 1200 mhz. --> maybe more is possible
1.075 @ 1.09x with 1200 mhz. --> also more possible

oc memory doesn't bring anything to the table. clocking from 1200 to 1225 only brings 1.x kHs more. lol. i am just doing it for christs sake

I don't get it why to buy 7950 cards when these are maybe 30% more efficient.

LN17tbYHiiagVcvXNeayVNz2bcJxo2no4v or
1CxrhPAr166NrQWhmAf7CvUNAxmxFHoSQa

if you liked it

zenrog

member

Activity: 229

Merit: 45

Quote from: p00chie on May 21, 2013, 06:36:33 AM

Quote from: Yurizhai on April 29, 2013, 11:42:31 PM

CGminer. 7850's are just a bitch for scrypt - at least in my experience. I get 330 Mhash/sec easy but nothing I do for khash works.

i am running a rig with 6x msi 7850 and i am getting 400kHs at least out of every one. 3 are better so i get around 415 kHs

Bought them cheap for 122€ so it is 2.40 kHs to 2.45 kHs for only 730 €

i have never tested btc though ...

Clocks?

p00chie

member

Activity: 115

Merit: 10

Quote from: Yurizhai on April 29, 2013, 11:42:31 PM

CGminer. 7850's are just a bitch for scrypt - at least in my experience. I get 330 Mhash/sec easy but nothing I do for khash works.

i am running a rig with 6x msi 7850 and i am getting 400kHs at least out of every one. 3 are better so i get around 415 kHs

Bought them cheap for 122€ so it is 2.40 kHs to 2.45 kHs for only 730 €

i have never tested btc though ...

Yurizhai

hero member

Activity: 764

Merit: 500

CGminer. 7850's are just a bitch for scrypt - at least in my experience. I get 330 Mhash/sec easy but nothing I do for khash works.

pr0d1gy

hero member

Activity: 658

Merit: 502

Have you tried over clocking? Hit like 1000mhz...

You using GUIminer? Or what?

Yurizhai

hero member

Activity: 764

Merit: 500

Quote from: pr0d1gy on April 29, 2013, 11:17:58 PM

Whats

Quote from: Yurizhai on April 29, 2013, 10:40:27 PM

Wow thank you so much man. Been struggling forever to get more than 280 hash a sec, your settings are getting me 350!

Wait wait.. no.. I'm getting HW..

What's HW?

Hardware errors. You shouldn't be getting any, I got a couple within seconds on those settings.

pr0d1gy

hero member

Activity: 658

Merit: 502

Whats

Quote from: Yurizhai on April 29, 2013, 10:40:27 PM

Wow thank you so much man. Been struggling forever to get more than 280 hash a sec, your settings are getting me 350!

Wait wait.. no.. I'm getting HW..

What's HW?

Yurizhai

hero member

Activity: 764

Merit: 500

Wow thank you so much man. Been struggling forever to get more than 280 hash a sec, your settings are getting me 350!

Wait wait.. no.. I'm getting HW..

Topic: 7850/7870 LTC performance (Read 3924 times)