The NVIDIA GeForce GTX 970 Review: Featuring EVGA
by Ryan Smith on September 26, 2014 10:00 AM ESTOverclocking
With GTX 980 we saw first-hand how GM204 had very significant overclocking headroom. Even without the ability to meaningful overvolt on NVIDIA cards, we were able to push our base GPU clock speed up from 1126MHz to 1377MHz, or in terms of the maximum boost bin, from 1265MHz to 1515MHz. Consequently with GTX 970 shipping at lower clock speeds, we have very lofty expectations here.
But running counter to that will be TDP. As we have already seen, GTX 970 is TDP limited right out of the gate, so even if our card has more clock speed headroom, its 110% TDP limit doesn’t leave much more in the way of power headroom. Furthermore as this is already a factory overclocked card, there’s no guarantee that EVGA has left us much overclocking headroom to play with in the first place.
| EVGA GeForce GTX 970 FTW Overclocking | ||||
| FTW | Overclocked | |||
| Core Clock | 1216MHz | 1241MHz | ||
| Boost Clock | 1367MHz | 1392MHz | ||
| Max Boost Clock | 1418MHz | 1455MHz | ||
| Memory Clock | 7GHz | 7.8GHz | ||
| Max Voltage | 1.218v | 1.243v | ||
And in fact our results show they haven’t. We aren’t able to get even another 50MHz out of our GPU before errors start setting in; 25MHz is all we will get, which pushes our base GPU clock speed from 1216MHz to 1241MHz, and our maximum boost clock from 1418MHz to 1455MHz. Overall this is a weaker overclock than GTX 980, though not immensely so.
Meanwhile memory overclocking was just as fruitful as it was on GTX 980, with our card being able to handle up to 7.8GHz on its GDDR5 memory. As we saw with GTX 980 we’re nearly as memory bandwidth bottlenecked as we are GPU bottlenecked, but we will take what performance we can get.
As you’d expect from such a mild overclock, the performance increase is very limited. Our overclocked GTX 970 FTW does close on GTX 980 even more, but even with this full overclock it won’t overcome the 3 SMM deficit.
Overall in all likelihood the GTX 970 FTW benefits more from the 10% increase in TDP than it does the clock speed increase. GTX 970 – and GM204 in general – clearly desires to be fed with more voltage and more power overall than what any NVIDIA approved card is going to see.
Power consumption and noise tick up, but only slightly. The limited 10% TDP increase means that the amount of power the card can draw and dissipate as heat only increases slightly. You aren’t getting much more performance, but you also aren’t getting much more noise.
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AnnonymousCoward - Sunday, September 28, 2014 - link
So you're saying it doesn't matter to say "clocked at 7GHz" when the actual clock is 1.75GHz. Well it matters to me! What if the chip multiplies the core clock by 2 internally; should we then say the core clock is 2.2GHz instead of 1.1GHz?Black Obsidian - Monday, September 29, 2014 - link
And thus the reporting of EFFECTIVE clock speeds. Not everyone does (or can) understand the complexities of the underlying architecture.jtrdfw - Wednesday, September 30, 2015 - link
yes. heatsinks on memory are pretty much a scamMagickMan - Friday, September 26, 2014 - link
How about a 970 OC vs 290 OC comparison? I don't have a favored GPU, I just care about bang for buck.The_Assimilator - Friday, September 26, 2014 - link
What would be the point? 970 already equals or beats 290X, and you don't get much from overclocking Hawaii GPUs, apart from more heat.poohbear - Friday, September 26, 2014 - link
Thank u for including a full stable of previous gen video cards to compare it to! In particularly the 670 & 770! Gives us a better idea of how it performs!Tetracycloide - Friday, September 26, 2014 - link
Seconded. Still running a 6950 flashed to 6970 so having the stock 6970 as a point of reference made this the easiest buy ever. Roughly twice the performance with lower power, heat, and noise? Yes.roxamis - Monday, September 29, 2014 - link
I have the same card (Sapphire 6950 Dirt 3, unlocked to 6970) and one fan of the 2 died last week (hitting 90-100 deg C in games). So with that I went to see what i can replace it with and the 970 ticks all my marks.krazyfrog - Friday, September 26, 2014 - link
The price-to-performance ratio is strong with this one.Frenetic Pony - Friday, September 26, 2014 - link
Certainly, but considering AMD has implemented some of the same things I'd expect an equivalent price to performance ratio from AMD for their new cards. Cut down the 290's bus to 256bit, clock the ram to 7ghz, and with the bandwidth compression you'd get a cheaper card with the same performance.Still, nice all around to have choices, been looking at cards myself, and am going to build a system for my brother quite soon. Yay price wars!