The NVIDIA GeForce GTX 650 Ti Review, Feat. Gigabyte, Zotac, & EVGA
by Ryan Smith on October 9, 2012 9:00 AM ESTCompute Performance
As always our final set of real-world benchmarks is composed of a look at compute performance. As we have seen with GTX 680 other Kepler cards, Kepler appears to be significantly less balanced between rendering and compute performance than GF110 or GF114/GF116 were, and as a result compute performance suffers. On the other hand, relative to the GTX 660 the GTX 650 Ti sacrifices a smaller portion of its compute performance than its ROP/L2/memory performance, so this may bode better for computer performance.
Our first compute benchmark comes from Civilization V, which uses DirectCompute to decompress textures on the fly. Civ V includes a sub-benchmark that exclusively tests the speed of their texture decompression algorithm by repeatedly decompressing the textures required for one of the game’s leader scenes. Note that this is a DX11 DirectCompute benchmark.
There really isn’t a lot to say here. The GTX 650 Ti is only slightly ahead of the GTX 550 Ti, never mind the GTX 560. Worse, it’s tied with the 7770 and well behind the 7850. Given the nature of the test, with cards on memory busses this small I believe we’ve run into a proxy test for memory bandwidth rather than compute throughput. Which just goes to show that all of that compute throughput is meaningless without the memory bandwidth and cache to feed the best.
Our next benchmark is SmallLuxGPU, the GPU ray tracing branch of the open source LuxRender renderer. We’re now using a development build from the version 2.0 branch, and we’ve moved on to a more complex scene that hopefully will provide a greater challenge to our GPUs.
Not surprisingly, the GTX 650 Ti loses to just about everything. SmallLuxGPU’s OpenCL renderer just doesn’t mesh well with Kepler and NVIDIA’s drivers. The resulting lead for the 7850 is nothing short of massive.
For our next benchmark we’re looking at AESEncryptDecrypt, an OpenCL AES encryption routine that AES encrypts/decrypts an 8K x 8K pixel square image file. The results of this benchmark are the average time to encrypt the image over a number of iterations of the AES cypher.
Unlike our previous OpenCL benchmark the GTX 650 Ti’s showing isn’t nearly as bad, but neither is it great. Both the GTX 560 and the 7770 are in the lead, but at least the improvement over the GTX 550 Ti is nothing short of amazing. At times NVIDIA’s problem isn’t where GTX 650 Ti is compared to last-generation cards, but rather it is compared to AMD’s strong Radeon HD 7000 series lineup.
Our fourth benchmark is once again looking at compute shader performance, this time through the Fluid simulation sample in the DirectX SDK. This program simulates the motion and interactions of a 16k particle fluid using a compute shader, with a choice of several different algorithms. In this case we’re using an (O)n^2 nearest neighbor method that is optimized by using shared memory to cache data.
Once more the GTX 650 Ti is in trouble. It can beat the GeForce 500 series, but even the 7770 is faster.
Finally, we’ll take a look at one last benchmark to our compute run with the benchmarkable version of the Folding@Home client. Folding@Home and similar initiatives are still one of the most popular consumer compute workloads, so it’s something NVIDIA wants their GPUs to do well at.
Here’s another case where memory bandwidth and L2 cache appear to be a problem. The GTX 650 Ti is much farther behind the GTX 660 than we would have expected, and even the GTX 560 can take a lead here. On the other hand memory bandwidth bottlenecking isn’t so bad that EVGA’s GTX 650 Ti can’t still take the lead over the other factory overclocked cards.
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flipmode - Tuesday, October 9, 2012 - link
Please, that mantra is goofy. Of course there is such a thing as a bad product. You're telling me you've never run into a product that you wouldn't buy at any price? I have. Not saying the GTX 650 Ti fits that description - it doesn't - but I just wish you'd dispense with that silly expression.Paulman - Wednesday, October 10, 2012 - link
I think it's a good saying, especially when applied to the two horse race between AMD/ATI and NVIDIA. Both companies have been executing fairly well over the past half decade or more, and ultimately the biggest factor that determines the success or value of a card is the performance vs. price. The only thing that would mess with that is a significant spat of failing parts, or ridiculously high power/noise consumption that can't be mitigated, or unfixably buggy drivers. But barring such catastrophe scenarios, if your part isn't that great by the time it hits the market, just lower the price :PCeriseCogburn - Friday, October 12, 2012 - link
It's amazing the amd fanboy brain farts spewing here.AMD lowered their frikkin 7850 price, not the card that "isn't that great that just hit the market".
I'll also point out that this nVidia card does 4 monitors out of the box, and the Asus version at the egg has a great port setup for that, and is inexpensive.
It's just amazing to me really. AMD drops in price, and the idiot response is late and slow for the card reviewed demanding a lower price.
LOL - it's so so freakin sad.
rarson - Friday, October 12, 2012 - link
You don't understand economics, do you?Homeles - Saturday, October 13, 2012 - link
"AMD lowered their frikkin 7850 price, not the card that 'isn't that great that just hit the market.'"You need to brush up on your reading comprehension skills, kid. You have completely missed the point of the post you are replying to. Quite laughably, really, especially given your condescension.
Siana - Monday, October 15, 2012 - link
OMG a sane person on the Internet!JIHAAAAD!!!!!!!!!!!!!
Uritziel - Thursday, October 11, 2012 - link
Nothing keeps a price from being negative, so the saying isn't really wrong. Bet you'd buy that bad product you have in mind for -$5000...CeriseCogburn - Friday, October 12, 2012 - link
Here, where are the amd fanboys usual bloviating load of crap spews ?I'll pretend I'm them.
This card OverClocks to 7850 speeds and passes it for $5o LESS ! you'd have to be an idiot to buy the amd card when every single nVidia 650Ti hit the same awesome overclock flying past the 7850 !
Not to mention eyefinity sucks and is dead now that 4 monitors are rockin on these 650Ti's !
I'd sure like to see amd innovate but all they care about is MONEY $$$ so they charge more!
There we go amd fanboys, FTFY, and the worse part of it all for you is it's all true instead of big fat lies like when you do it !
rarson - Friday, October 12, 2012 - link
This has nothing to do with fanboys, just like the last post didn't. We're talking about economics here, not AMD vs. Nvidia. Stop looking at everything through your green-tinted glasses and try reading what is actually on the screen. The comment you replied to has nothing to do with the cards you mentioned.Galidou - Saturday, October 13, 2012 - link
He says everyone is lying when speaking about AMD while he can hardly stay in the right path himself.... He's taking the side of the most powerful companies in the world(anything that's against AMD is worth taking their side) while spewing shit like: ''all they care about is MONEY $$$.''Let's go, take the side of the giants of this world, kill the small companies spewing shit about them so the world can turn more monopolistic than it is now... LoL funniest vomit the world had to know about... Make the rich even more rich and KILL everyone below... I have to admit AMD is in a bad situation, their CPU division fares ALOT worse than their GPU division but it's not a reason to be so stupid... so freaking imbecile..... Just so stubbornly refusing to have any respect toward anyone that doesn't TOTALLY embrace his stupid closed vision of the computer industry.
I just wish AMD gets out of there, if not then too bad, we can't change things for them. They are fighting against the giants of the computer industry that have a hundred times more budget than they do... Just for that, I'm wishing they succeed in the future.