thenoblebot (OP)
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December 17, 2013, 08:32:29 PM |
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Hey,
I JUST HAVE TO GET A CARD in the NEXT 12 HOURS !!
From what I have read R9 280x is just a modified version of 7970 .
So R9 280x costs extra too . Should I opt for a 7970 or a R9 280x ?
Any reason to opt for one or the other ... seeing around seems like the hashrate looks somewhat the same (correct me if I am wrong).
Anybody who has experience or knows some technical details about hese cards ?
Regards
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Junkey
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December 17, 2013, 08:40:43 PM |
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I had the same problem. I ended up going with the 7970 3GB GHZ edition when it was on sale for $250. The sale made it obvious. Everything I have read says what you were saying. How the 280x is just a rebranded 7970. Get the cheaper 7970.
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thenoblebot (OP)
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December 17, 2013, 08:47:38 PM |
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I had the same problem. I ended up going with the 7970 3GB GHZ edition when it was on sale for $250. The sale made it obvious. Everything I have read says what you were saying. How the 280x is just a rebranded 7970. Get the cheaper 7970.
What about the hash rates that you are getting ?
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matt4054
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December 17, 2013, 08:50:31 PM |
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I have both and the R9 280x gives me 650 while my 7970s are between 550 and 625.
If you don't plan reselling to gamers, go for a 7950, it's still the best value IMHO.
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superduh
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December 17, 2013, 08:52:53 PM |
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this is a silly question. get whatever is available! ![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
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ok
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thenoblebot (OP)
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December 17, 2013, 08:53:06 PM |
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I have both and the R9 280x gives me 650 while my 7970s are between 550 and 625.
If you don't plan reselling to gamers, go for a 7950, it's still the best value IMHO.
I was under the impression a R9 280x would give about 700 (without much tweaking) ... also a 7950 is 25% more costly and gives about 600ish with best settings ... so thinking about economics too for the same hash rate.
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thenoblebot (OP)
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December 17, 2013, 08:54:26 PM |
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this is a silly question. get whatever is available! ![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif) actually both are ![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
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matt4054
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December 17, 2013, 08:57:05 PM |
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I was under the impression a R9 280x would give about 700 (without much tweaking) ... also a 7950 is 25% more costly ... so thinking about economics too for the same hash rate.
So was I, and I was disappointed. Something must be wrong with my card, maybe. If I try optimized settings I only get HW errors even at -I 12, so I have TC at 8192, -g at best, etc. and I only got to 650 by OC to 1200 instead of 1150 native (it's winter time yay), it would only go up to 615 with default settings. I have tried on 2 different rigs (AMD and Intel based), maybe I'll try on Linux/BAMT instead on Win7 when I get the chance.
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thenoblebot (OP)
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December 17, 2013, 09:01:45 PM |
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So was I, and I was disappointed. Something must be wrong with my card, maybe.
If I try optimized settings I only get HW errors even at -I 12, so I have TC at 8192, -g at best, etc. and I only got to 650 by OC to 1200 instead of 1150 native (it's winter time yay), it would only go up to 615 with default settings.
I have tried on 2 different rigs (AMD and Intel based), maybe I'll try on Linux/BAMT instead on Win7 when I get the chance.
Is that a sapphire R9 280x ? can you tell me the exact model ? coz I might just end up buying that one ..... hope i dont
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Mblackout
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BitRoll
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December 17, 2013, 09:11:56 PM |
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Hey,
I JUST HAVE TO GET A CARD in the NEXT 12 HOURS !!
From what I have read R9 280x is just a modified version of 7970 .
So R9 280x costs extra too . Should I opt for a 7970 or a R9 280x ?
Any reason to opt for one or the other ... seeing around seems like the hashrate looks somewhat the same (correct me if I am wrong).
Anybody who has experience or knows some technical details about hese cards ?
Regards
What are you mining with GPU?
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matt4054
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December 17, 2013, 09:16:38 PM |
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Is that a sapphire R9 280x ? can you tell me the exact model ? coz I might just end up buying that one ..... hope i dont
Yes it is, a Sapphire Toxic R9 280X 3GB GDDR5 PCIe. Besides the hashrate problem, it looks pretty cool, but... toxic ![Huh](https://bitcointalk.org/Smileys/default/huh.gif)
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thenoblebot (OP)
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December 17, 2013, 09:20:05 PM |
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What are you mining with GPU?
scrypt coin
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thenoblebot (OP)
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December 17, 2013, 09:22:32 PM |
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Yes it is, a Sapphire Toxic R9 280X 3GB GDDR5 PCIe. Besides the hashrate problem, it looks pretty cool, but... toxic ![Huh](https://bitcointalk.org/Smileys/default/huh.gif) Ok thanks ... will try to avoid that one for sure .... the guy said he has only sapphire .... if i buy that one I hope I don't get stuck with bad hashrates ..... So are you suggesting a 7970 ? PS : i have a 7950 already its giving me 560 + a bit with tweaking
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Jama
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December 17, 2013, 09:28:05 PM |
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I have 3 x R9 280x and all are stable at 726 Khash with more available. They are the VRX type.
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thenoblebot (OP)
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December 17, 2013, 09:50:19 PM |
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I have 3 x R9 280x and all are stable at 726 Khash with more available. They are the VRX type.
Wow that sounds impressive ... but I am thinking about quantities for approx same price (7970 x 4) = 2.6 Mhps (650 each avg) (280x x 3) = 2.2 Mhps (725 each avg) So for approx the same price I would get more hashes with 7970 ... am i correct ?
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Number6
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December 17, 2013, 10:26:36 PM |
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R9 280x and 7970 are effectively the same card. I own a few of each and they both can get to 750 kHash equally well with modest overclocking and some tweaking of cgminer settings.
One thing to note, there are now Rev 1 and Rev 2 R9 280x cards out there. I believe the Rev 1 was literally a rebadged 7970, whereas I notice the newer Rev 2 cards come in a little lower voltage by default and run a bit cooler while maintaining the same hash rate.
There are many detailed comparisons out on the web with much more information than I can give you, but for mining scrypt I would take whichever card you can find cheaper. I might give the nod to the newer Rev. 2 280x's though if price is about the same as it does seem you gain a bit of power efficiency without having to mess around with under-volting yourself, especially with the cards you need to flash the BIOS to play with the voltages.
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BTC: 18jdvLeM6r943eUY4DEC5B9cQZPuDyg4Zn LTC: LeBh9akQ3RwxwpUU6pJQ9YGs9PrC1Zc9BK
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thenoblebot (OP)
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![](https://bitcointalk.org/Themes/custom1/images/post/xx.gif) |
December 17, 2013, 10:33:24 PM |
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R9 280x and 7970 are effectively the same card. I own a few of each and they both can get to 750 kHash equally well with modest overclocking and some tweaking of cgminer settings.
One thing to note, there are now Rev 1 and Rev 2 R9 280x cards out there. I believe the Rev 1 was literally a rebadged 7970, whereas I notice the newer Rev 2 cards come in a little lower voltage by default and run a bit cooler while maintaining the same hash rate.
There are many detailed comparisons out on the web with much more information than I can give you, but for mining scrypt I would take whichever card you can find cheaper. I might give the nod to the newer Rev. 2 280x's though if price is about the same as it does seem you gain a bit of power efficiency without having to mess around with under-volting yourself, especially with the cards you need to flash the BIOS to play with the voltages.
I am getting 7970s cheaper than 280x and its about $50-70 cheaper .... so considering what you said it would be best to buy a 7970 for the same hashrates then ........ btw what 7970 model are you using ? I think Ill go with 7970
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