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Author Topic: Help/Advice for optimizing 2x Sapphire 7950 3GB  (Read 3917 times)
sv4ol84a6v79a46ilby
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April 13, 2013, 12:48:56 PM
 #1

These: http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1157&lid=1&pid=1439&leg=0

I am presently running both with all 7 boxes checked and no flags. No flags because I am using the computer.

First one stays at 415.8 Mh/s (occasionally increases ~1Mh/s),
second one is the same almost all the time and only varies ~5 Mh/s, probably because that's the one my monitor is connected to.



Is this a good rate? Or should it be a lot better? What can I do to optimize it?

More details:

Software:
  • Windows 7 Ultimate x64 (Custom Slim & Fast Version)
  • GUIMiner v2012-12-03

Primary Hardware:
  • GPU: Sapphire HD 7950 3GB GDDR5 x2
  • CPU: Intel Core i7-3770K
  • PSU: CORSAIR CMPSU-750TX 750W
  • RAM: Patriot Viper 3 16GB 1866Mhz
  • Cooling: STOCK (room temp: ~60°F/15°C)

Other factors:
  • Daily use PC
  • Running GPU fan on 100%
  • Intend to run 24/7 simultaneously
  • GPU temp remains stable between 63° and 66°C

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April 13, 2013, 01:25:30 PM
 #2

I have 2x Sapphire 7950s (likely for the same reason you do, they've been on sale).

I'm getting around 500Mh/s at 950Mhz core (make sure to max the power limit when overclocking). I can get about 580 at 1100mhz but the fans and temperatures spike to alarming levels so I'm going to repaste the heat sinks with IC Diamond and see.

cgminer.exe -u youruser -p password -o http://pool.com -k diablo -v 1 -w 256 -I 9
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April 13, 2013, 02:36:50 PM
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I have 2x Sapphire 7950s (likely for the same reason you do, they've been on sale).

I'm getting around 500Mh/s at 950Mhz core (make sure to max the power limit when overclocking). I can get about 580 at 1100mhz but the fans and temperatures spike to alarming levels so I'm going to repaste the heat sinks with IC Diamond and see.

cgminer.exe -u youruser -p password -o http://pool.com -k diablo -v 1 -w 256 -I 9

no mine are the higher end models. the new ones are not as powerful.

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April 15, 2013, 12:17:14 AM
 #4

These: http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1157&lid=1&pid=1439&leg=0

I am presently running both with all 7 boxes checked and no flags. No flags because I am using the computer.

First one stays at 415.8 Mh/s (occasionally increases ~1Mh/s),
second one is the same almost all the time and only varies ~5 Mh/s, probably because that's the one my monitor is connected to.



Is this a good rate? Or should it be a lot better? What can I do to optimize it?

More details:

Software:
  • Windows 7 Ultimate x64 (Custom Slim & Fast Version)
  • GUIMiner v2012-12-03

Primary Hardware:
  • GPU: Sapphire HD 7950 3GB GDDR5 x2
  • CPU: Intel Core i7-3770K
  • PSU: CORSAIR CMPSU-750TX 750W
  • RAM: Patriot Viper 3 16GB 1866Mhz
  • Cooling: STOCK (room temp: ~60°F/15°C)

Other factors:
  • Daily use PC
  • Running GPU fan on 100%
  • Intend to run 24/7 simultaneously
  • GPU temp remains stable between 63° and 66°C

When I increased the GPU clock to 1050, it increased to over 500Mhash/s
Combined total is remaining stable between 1.005 and 1.015 Ghash/s


Keeping the window open in my closet where my PC is, and fans on 100%, GPU temp for both so far are stable at 69°C. Room temp is probably around ~60°F/15°C.

Notes:
  • Additionally, using the flags -v -w 128 increases 20 to 30 Mhash/s (without the flags it's a combined total of about 985Mh/s). But with those flags you can't be also using the computer or it will crash.
  • Using latest version of GUIMiner
  • I attempted to raise clock to 1070, but shortly after doing so it froze GUIMiner and said "display driver successfully recovered from error." I assume it "recovered" by freezing GUIMiner.
  • Cards are in crossfire mode, although each is running individually in GUIMiner. This is because for some reason the latest CCC will only allow me to individually modify Graphics Overdrive for each card if it is in crossfire mode. If I take it out of crossfire mode then it only shows the Graphics Overdrive options for one of the cards.
  • Increasing Memory Clock does not affect performance in GUIMiner. Thus I kept the Memory clock at stock speeds (1250).

bitcoiner49er
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April 26, 2013, 02:21:10 PM
 #5

You don't mention what you are using for CCC and SDK.

I am running BFGminer, Intensity 9. (No other flags) on Win 7
CCC 12.8
SDK 2.7
1100 Mhz clock
300 Mhz Memory (lowers temp)
1.050 Voltage
65% fans (open case)
Temp: 71-74 C

I'm getting 575 Mh/s per Sapphire HD 7950 3GB, steady.

I don't use mine for much, just checking bitcoin related webpages.

I'm drawing about 630-640 Watts at the wall.

Homo doctus is se semper divitias habet
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