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7950 vs 7970, is there any difference besides clock speed? - Page 2

post #11 of 30
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Quote:
Originally Posted by ahnafakeef View Post

OP : Are you buying new cards? If so, then why? whats wrong with your 670 SLI?

Also, if you arent aware of it already, the 700 series from nvidia are to be released on the 23rd of this month. I strongly suggest that you wait until the official specs and reviews come out. See how they perform and are priced, then make an informed decision. As per the rumors, the GTX 780 is going to be a cut-down Titan with 80-90% performance of a Titan and will hopefully be priced within $500--$600. That is going to be an amazing card and have an amazing price/performance ratio if the numbers are anywhere near the real thing.

I'm surprised that no one else has suggested you to wait for the 700 series. Its not worth buying two year old hardware so close to the release date of the next gen of cards. You'll most likely regret it if you do.

Also, about CF : AMD's multi-GPU solutions are a mess right now. Stuttering and low performance in frame time latency tests are two of the major problems with crossfire right now. AMD is supposed to release new drivers to fix this issue sometime in June. But who knows how much of a fix that will be. But if you're going for a single card, the 7970 will be fine. Although, the 780 will give better price/performance if the rumored prices are true.

I really don't know if I'm buying new or used. But I am up for both options. As for NV and the 700 series, I've been following them closely and definitely anticipating their launch next week. I'm just preparing for a back up plan in case it flops crazy

Nothing is wrong with my 670 SLI. But I do want to prepare for BF4 this winter, and my 2gb cards are already taxed at my resolution. So 3gb should keep me covered for BF4, at least I hope.
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post #12 of 30
Quote:
Originally Posted by ahnafakeef View Post

OP : Are you buying new cards? If so, then why? whats wrong with your 670 SLI?

Also, if you arent aware of it already, the 700 series from nvidia are to be released on the 23rd of this month. I strongly suggest that you wait until the official specs and reviews come out. See how they perform and are priced, then make an informed decision. As per the rumors, the GTX 780 is going to be a cut-down Titan with 80-90% performance of a Titan and will hopefully be priced within $500--$600. That is going to be an amazing card and have an amazing price/performance ratio if the numbers are anywhere near the real thing.

I'm surprised that no one else has suggested you to wait for the 700 series. Its not worth buying two year old hardware so close to the release date of the next gen of cards. You'll most likely regret it if you do.

Also, about CF : AMD's multi-GPU solutions are a mess right now. Stuttering and low performance in frame time latency tests are two of the major problems with crossfire right now. AMD is supposed to release new drivers to fix this issue sometime in June. But who knows how much of a fix that will be. But if you're going for a single card, the 7970 will be fine. Although, the 780 will give better price/performance if the rumored prices are true.
Welcome, anti-AMD. Now another AMD thread is officially ruined again
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post #13 of 30
Probably because you can find 7950 for 250 each. 2x7950>> 780
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post #14 of 30
Quote:
Originally Posted by AndroidVageta View Post

The 7970 dominates. That Hexus review is over a year old and doesn't reflect the MASSIVE difference in performance the drivers have delivered. YES the 7950 is a nice card, but the whole "5% difference at same clocks" simply doesn't stand. Plus one has to remember that the 7970 overclocks as well. A overclocked 7970 jumps in performance DRAMATICALLY. The difference between my 7970 at stock (950mhz) vs. overclocked (1200mhz at time of testing) was 20fps in Tomb Raider. TWENTY FRAMES PER SECOND! It is absolutely ridiculous the performance differences when overclocking.

That part is filled with fallacies. You said Hexus benchmark with 7950/70 at same clocks doesn't stand anymore with newer drivers. But you didn't explain why. and you didn't proof it. Your anandtech link doesn't prove anything, it compares 7970 at 1.05 GHz to a 7950 running between 850 to 925 MHz depending on load.
HD7950 & 7970 are both based on the same chip and both are Tahiti cards. When there are driver improvements they both benefit from the driver tweaks as well. it is not limited to HD7970 only.

OP: The only difference between 7970 & 7950 is the shader count (2048 vs. 1792), shader count to clock for clock difference doesn't scale linearly. Also HD7970 generally reaches higher clocks (Much easier to reach 1200 MHz+), HD7950 reaches around (1150-1175 MHz) on average.
But that mainly depends on your luck, there is a probability of a dud 7970 and a golden 7950 or vice versa, it depends on the luck of the draw really.
But the probability of reaching higher clocks on the 7970 is generally higher since it is a higher binned chip.
Edited by HeadlessKnight - 5/17/13 at 2:44am
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post #15 of 30
double post.
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post #16 of 30
Quote:
Originally Posted by steven88 View Post

I really don't know if I'm buying new or used. But I am up for both options. As for NV and the 700 series, I've been following them closely and definitely anticipating their launch next week. I'm just preparing for a back up plan in case it flops crazy

Nothing is wrong with my 670 SLI. But I do want to prepare for BF4 this winter, and my 2gb cards are already taxed at my resolution. So 3gb should keep me covered for BF4, at least I hope.
BF4 releases no sooner than October, right? If that is the only game you're worried about and the only game that you think will max your VRAM limit, then why not wait a few months to let the 700 series cards come down in price and then grab a few of those? It'll also drastically push down the prices of 7000/600 series cards as well if you are willing to buy older cards. Also, the fix for crossfire will also most likely be out by then and you can consider AMD as well. 670 SLI should be able to serve you well until then, at least in terms of raw GPU horsepower.

Speaking for the purchase of 780s at launch, I'd get two of them if they are priced at $650 or below. Should perform similar to 79x0 trifire when overclocked. But thats just me though.
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post #17 of 30
P10676

http://www.3dmark.com/3dm11/5059839

P11259

http://www.3dmark.com/3dm11/6564785

edit: for some reason my 7970 gets lower minimums (a tad lower) in BF3 MP. could be the latest driver.
Edited by rdr09 - 5/17/13 at 2:49am
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post #18 of 30
Quote:
Originally Posted by DaveLT View Post

Welcome, anti-AMD. Now another AMD thread is officially ruined again
I'm sorry that you feel that way, but I was just suggesting the most practical and logical option to the OP.

Also, if you havent noticed, this is just a back-up plan for the OP. He's got his eyes on the 700 series too. tongue.gif
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post #19 of 30
Quote:
Originally Posted by HeadlessKnight View Post

That part is filled with fallacies. You said Hexus benchmark with 7950/70 at same clocks doesn't stand anymore with newer drivers. But you didn't explain why. and you didn't proof it. Your anandtech link doesn't prove anything, it compares 7970 at 1.05 GHz to a 7950 running between 850 to 925 MHz depending on load.
HD7950 & 7970 are both based on the same chip and both are Tahiti cards. When there are driver improvements they both benefit from the driver tweaks as well. it is not limited to HD7970 only.

OP: The only difference between 7970 & 7950 is the shader count (2048 vs. 1792), shader count to clock for clock difference doesn't scale linearly. Also HD7970 generally reaches higher clocks (Much easier to reach 1200 MHz+), HD7950 reaches around (1150-1175 MHz) on average.
But that mainly depends on your luck, there is a probability of a dud 7970 and a golden 7950 or vice versa, it depends on the luck of the draw really.
But the probability of reaching higher clocks on the 7970 is generally higher since it is a higher binned chip.

Pretty much this, 7970 is better in ~every way, but a golden 7950 pwns a dud/below average 7970.

And btw I also get those 20fps gains in games when comparing stock 880MHz to an overclocked 1150MHz 7950, so...
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post #20 of 30
Quote:
Originally Posted by steven88 View Post

Thanks for the informative post. I will keep this in mind. My budget isn't necessarily "tight"....but at the same time, I do appreciate bang for the buck. I also game at 2560x1600. Maybe the 7970's are more worth it than?

Also a quick question, is the GHZ edition simply a factory OC? Does it feature more unlocked shaders versus the original 7970, or something?

Of course 7970 performs better at the higher clocks than stock clocks, but the case was if those cards are running at the same clocks you are still 5% behind with that 7950.
So you need to do overclocking to get 7950 running at the same clocks where 7970 already is and you are still 5% behind. Only Tahiti - god knows if you can push that 7950 higher than hd7970.

Basically 7970GHz is overclocked version of the 7970, but it also has faster memory than "vanilla" hd7970

Memory Bandwidth
288 GB/s 7970GHz
264 GB/s 7970

So if you are running 7970 at stock clocks and 7970GHz at the stock clocks then 7970GHz is about 10% faster. But keep in mind that it's 925MHz versus 1050MHz. You can easily make 7970 run at 1050MHz or higher. There is no difference between 7970Ghz and 7970 what it comes to overclocking, GHz - edition doesn't mean better overclocking capability.

So for my opinion, like I said, I would go to two cheapest 7970GHz edition, forget that overclocking and just enjoyed the gaming!
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