Topic Title: Radeon HD7950 GPU-Z reporting 1536 shaders.
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Created On: 12/15/2013 05:48 PM
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 12/15/2013 05:48 PM
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fyca
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I just bought a 7950 card on ebay and it reports that it has on 1536 shaders. This is very odd as seeing that the 7950 should have 1792 shaders. The other thing that strikes as odd is that the device ID is 1002-679a and subsystem device ID is 1002-0b00. After doing some research that subsystem ID matches the 5870, but the device ID matches the 7950. It gets even wierder as the card reports 3Gb of memory, but I cannot find a 5870 that came with 3Gb memory. The GPU reports as Tahiti and not Pitcairn. If this was a 5870 card with a 7950 bios flashed to it I would think it would not operate as the GPU would be so different. Another odd thing is that the card has a 6+8 pin PCIE power whereas the 7950 has 6+6 pin PCIE. Also in GPU-Z the gpu reports 800mhz clock and memory reports 925mhz clock. I'm not sure what to think, did I get ripped off? I paid $300 for this card. Did somebody just mess up a bios flash? Can this be fixed to unlock the rest of the 1792 shaders? The seller did put in his Ebay listing that he was selling a Radeon 7950 with 1536 shaders so I think I might be out of luck on trying to get my money back. Any help would be appreciated. Thank You.

Edit: If the upload dialog worked I would upload pics and sceenshots.



Edited: 12/19/2013 at 01:28 PM by fyca
 12/15/2013 06:15 PM
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fyca
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Pics and ScreenshotsCard PicGeeks 3DGPU-ZCard RearCard PowerCard Running

 12/15/2013 06:45 PM
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WMudrockJr
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I believe that is the difference in a 7950 and 7950B which does have 1792 shadders while the ealier had 1536. This something of a BIOS difference.



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 12/15/2013 07:35 PM
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fyca
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So after further digging I see the marking on this card as 109-C38637-00 which appears to be a reference 7970 card. What is wrong with the stream processors? If this card turns out to be bunk I guess now I can return the card for the ad being misleading, I thought I was buying a 7950.

 12/15/2013 08:41 PM
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fyca
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Originally posted by: WMudrockJr I believe that is the difference in a 7950 and 7950B which does have 1792 shadders while the ealier had 1536. This something of a BIOS difference.

 

After searching, I cannot find this 7950B with 1536 shaders. All the 7950B searches showed was that B stands for boost with a clock rate of 850mhz and Boost clock rate of 925. All GPU-Z I see for 7950B show 1792 shaders.

I'm almost convinced this is a 7970 reference with a bios flash gone wrong. 

 12/19/2013 01:13 PM
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fyca
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Nobody knows anything about this card?

 12/19/2013 02:20 PM
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Vantharas
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Out of curiosity what does it benchmark in a synthetic such as  3dmark11 or 3dmark firestrike? That will tell the story because a synthetic benchmark will tell us where it lands as far as performance goes . You may have something even wierder like a 6950. 

My 7950's came with 1792 shaders. 

I'm thinkin what you have there is a 6950 or maybe a 7870XT , which is why I asked about a 3dmark 11 or Firestrike benchmark result. 

Then again I'm sure I'm wrong but I am curious what it scores. 



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I5 3570K@4~5.0ghz: Gigabyte GA-Z77X-UD3H:Corsair Hydro H110 :16GB Corsair Vengeance DDR-3 1600: XFX Radeon 7950 @ 1100/1575 : Corsair AX 860 PSU: x1 WD Black 1TB HDD's: 90GB Agility 3: 960GB SSD : Creative Labs X-FI:Corsair 500R Arctic White Edition:3 22inch Monitors Eyefinity @ 5294x 1050 : Alienware Tact-X Keyboard: Razer Naga :Corsair Vengence 1500 Headset: Corsair SP2500 Speakers

 12/19/2013 02:36 PM
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fyca
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Originally posted by: Vantharas Out of curiosity what does it benchmark in a synthetic such as  3dmark11 or 3dmark firestrike? That will tell the story because a synthetic benchmark will tell us where it lands as far as performance goes . You may have something even wierder like a 6950. 

 

My 7950's came with 1792 shaders. 

 

I'm thinkin what you have there is a 6950 or maybe a 7870XT , which is why I asked about a 3dmark 11 or Firestrike benchmark result. 

 

Then again I'm sure I'm wrong but I am curious what it scores. 

 

I will let you know after I receive the card. Those images are from the Ebay listing. Do you know if the 6950 ever came built on the reference 7970 pcb with the markings 109-C38637-00?

 12/19/2013 04:00 PM
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Vantharas
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I can't answer that with certainty I'm thinking it may be an engineering sample 7950 if it only has 1536 shaders w/3gb of memory because Tahiti pro, and Tahiti XT performance is almost exactly the same. 

But we saw the Tahiti XT chip used in 7870XT editions. With only 2gb of memory. 

Thats why I was asking for a synthetic benchmark because it'll tell you where it lands performance wise and if it is a true 7950 or not be it enginering sample or a OEM card. 

As far as the markings are concerned I couldn't answer it because my 7950's are all non reference models. 



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I5 3570K@4~5.0ghz: Gigabyte GA-Z77X-UD3H:Corsair Hydro H110 :16GB Corsair Vengeance DDR-3 1600: XFX Radeon 7950 @ 1100/1575 : Corsair AX 860 PSU: x1 WD Black 1TB HDD's: 90GB Agility 3: 960GB SSD : Creative Labs X-FI:Corsair 500R Arctic White Edition:3 22inch Monitors Eyefinity @ 5294x 1050 : Alienware Tact-X Keyboard: Razer Naga :Corsair Vengence 1500 Headset: Corsair SP2500 Speakers

 12/19/2013 08:05 PM
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fyca
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In the pictures if you looked at them, the bios seems off to me. When I receive the card I will do an initial benchmark, then I'm gonna try and flash the bios with a stock 7970 bios and see what happens. Device ID 1002-679A SubVendor Id 1002-0B00 doesn't match any pci device listing I can find.

 12/27/2013 05:36 PM
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danji
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This looks exactly like a card I purchased locally here yesterday, however it was sold as being a 7970 reference card that was a pre-release engineering sample. The specs I'm reading are exactly as what you have pictured, and also they look exactly the same. I too was surprised when I found the device ID was actually for a 7950 not a 7970, and that it actually has less shaders than a 7950. Explains why I get only slightly less performance than my other 7950. Thankfully I only paid $180 for it, so all in all it still was kind of worth it, just wasn't that awesome deal that I was expecting. I would like to know if the OP successfully flashed a new bios, and if so, which one. I found a 7970 bios (version 015.012.000.004.000346) which is very similar to the one on my card now except for the differences in the device ID's.
 12/27/2013 05:42 PM
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fyca
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Originally posted by: danji This looks exactly like a card I purchased locally here yesterday, however it was sold as being a 7970 reference card that was a pre-release engineering sample. The specs I'm reading are exactly as what you have pictured, and also they look exactly the same. I too was surprised when I found the device ID was actually for a 7950 not a 7970, and that it actually has less shaders than a 7950. Explains why I get only slightly less performance than my other 7950. Thankfully I only paid $180 for it, so all in all it still was kind of worth it, just wasn't that awesome deal that I was expecting. I would like to know if the OP successfully flashed a new bios, and if so, which one. I found a 7970 bios (version 015.012.000.004.000346) which is very similar to the one on my card now except for the differences in the device ID's.

I just received the card today, I did flash a 7970 bios, possibly the same one your thinking about, it was for the 7970 GHZ edition. The new bios works and gives better GPU and MEM frequencies, but the shaders are still locked at 1536. I will post more info after I spend some more time playing with it trying to unlock the shaders.

 12/28/2013 02:38 PM
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fyca
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So after messing with bios flashing yesterday I've come to the conclusion that these cards are locked with 1536 shaders. However I am using my card for Litecoin mining and with the 7970 GHZ bios I am able to overclock the card to 1200MHZ on GPU and 1750MHZ on MEM and am getting around 630K hash/sec. I'll update this thread if I figure something else out.

 12/29/2013 02:05 AM
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syclone
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Hey, i bought from this exact same guy... what is going on???  

 

Same ebay listing and everything.  

 12/29/2013 01:48 PM
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syclone
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I've got mine going at around 600khash...so not too bad.  

 01/01/2014 04:38 PM
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fyca
Peon

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Originally posted by: syclone Hey, i bought from this exact same guy... what is going on???  

 

 

 

Same ebay listing and everything.  

 

I messaged the ebay seller and asked him and all he told me was that he bought them in bulk before bitcoin got huge. He said he knew nothing about the cards, but when I got my card I noticed that the bios switch was in position #2, I'm not sure why since both bioses where exactly the same. It seems to overclock well, pulling hash rates like normal 7950's but with higher clocks. At my current OC my temp gets no higher than 63c and VRM's stay around 56c with fan at 100%. I am satisfied with the card, just wish I knew what the story was behind them.

 01/01/2014 11:11 PM
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Abundantcores
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Its a 7870XT (Tahiti LE) how do i know that? i have one.

Something may have gone wrong at the assembly, they may have glued the wrong chip on it.

3DMark Fire Strike @ 1200 / 1575 http://www.3dmark.com/fs/1323524

 

[URL=http://s1056.photobucket.com/user/Hunbug76/media/jkhguygu_zpsab4653f2.png.html][/URL]

 01/22/2014 09:24 PM
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bravedog
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Originally posted by: fyca
Originally posted by: danji This looks exactly like a card I purchased locally here yesterday, however it was sold as being a 7970 reference card that was a pre-release engineering sample. The specs I'm reading are exactly as what you have pictured, and also they look exactly the same. I too was surprised when I found the device ID was actually for a 7950 not a 7970, and that it actually has less shaders than a 7950. Explains why I get only slightly less performance than my other 7950. Thankfully I only paid $180 for it, so all in all it still was kind of worth it, just wasn't that awesome deal that I was expecting. I would like to know if the OP successfully flashed a new bios, and if so, which one. I found a 7970 bios (version 015.012.000.004.000346) which is very similar to the one on my card now except for the differences in the device ID's.

 

I just received the card today, I did flash a 7970 bios, possibly the same one your thinking about, it was for the 7970 GHZ edition. The new bios works and gives better GPU and MEM frequencies, but the shaders are still locked at 1536. I will post more info after I spend some more time playing with it trying to unlock the shaders.

 

Please post the bios you used as well as your cgminer settings!  I have a lot of these cards but I can only get 560 KH out of them.  Thanks!

 02/14/2014 03:29 AM
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eric878
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Hey guys - especially fyca - I appear to be in the same boat.. I bought a Reference 7970 with 1536 shaders, it looks exactly like the one in the photos.  It immediately crashes when I try to mine with it (the 511 C false temp that many people run into, requires hard reboot).  I tried flashing the bios to a "Ghz" version from another forum, posted by a guy named pioneerisloud (I think this was his name).  Other people on that forum said it worked.. but I still have the same problem.

Can someone (fyca?) please describe exactly what BIOS you flashed to this reference (679A) card such that you were able to mine with it afterwards, with decent hash rate -- and where can I find this BIOS?

I'd really appreciate the help, thanks!  Been banging my head over this for hours and hours.

 

 

 02/15/2014 05:31 PM
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Vegan
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there is a new version of GPU-Z out, post that one's image

 



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