EVGA (Europe) just announced they have Titan Black and GTX 750 and 750Ti for sale. The latter for 150 euro, really cheap with 2GB. However not in stock so can not be ordered yet, but I won't.

---

Greetings from TJ

The GPU memory latency is supposedly better, so the GTX750Ti's memory bandwidth bottleneck might not be as bad as I first suspected. That said, compute performances are a bit 'all over the place'. It's definitely a wait and see situation for here.

My concerns for these cards are first and foremost compatibility; will it work straight out of the box, will an app revamp be required, will we have to wait on drivers or might they never be compatible (time, money and effort developing for an entry level GPU might well be better spent elsewhere).

If the apps work the memory bandwidth may or may not be an issue, but the performance/Watt should be very good nonetheless. Some of the Folding benchmarks are promising, so if they are not up to much for here they are good for there (SP), and possibly a Boinc project or two.

I get the distinct feeling that the 20nm Maxwell cards will bring exceptional performances for here, when they turn up. They won't all have memory bottlenecks, and performance/Watt is likely to be much better than with the 28nm versions (which are already great). I think it's really a good time to watch this space, and start to think about and prepare for future purchases; sell on existing hardware when the value is still good!

---

FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

Some more info on Maxwell.

http://international.download.nvidia.com/geforce-com/international/pdfs/GeForce-GTX-750-Ti-Whitepaper.pdf

gdf

NVidia are comparing the GTX750Ti to a 3 generation old GTX480 for performance and a GT640 for power usage, but not a GTX650Ti! For some games its roughly equal to a GTX480 and in terms of performance/Watt the GTX750Ti is 1.7times better than a GT640 (and similar). While it is a GX107 product, the name suggests its an upgrade to a GTX650Ti.

---

FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

One of my team mates has a couple 750Ti's and they keep failing here. They are running good at Einstein. I have encouraged our team members to post in here that have the new Maxwell cards.

http://www.gpugrid.net/show_host_detail.php?hostid=167781

---

Thanks. That is important information to share!

Both long and short run tasks are failing. All present task types are failing. Tasks fail quickly, 0 to 4sec.

This strongly suggests that the present app would need to be modified to support these GPU's. It's likely that the different architecture is the reason for GPUGrid failures (non-super-scalar...) and running CUDA 5.5apps. At Einstein they use a CUDA 3.x app IIRC - a much more unrefined CUDA version; more tolerant, but slower.

---

FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

I think I might be the one Coleslaw is referring about. I installed a pair of 750Ti cards in my computer yesterday and tried to run GPUGRID. No go, instant fail within a couple seconds. Einstein seems to run just fine. I bought these cards to run GPUGRID and I'm not to happy that they can't. I'm not that interested in running Einstein and other than F@H there isn't much else out there for GPUs. I refuse to participate in F@H anymore. If you need any info feel free to ask.

I think I might be the one Coleslaw is referring about. I installed a pair of 750Ti cards in my computer yesterday and tried to run GPUGRID. No go, instant fail within a couple seconds. Einstein seems to run just fine. I bought these cards to run GPUGRID and I'm not to happy that they can't. I'm not that interested in running Einstein and other than F@H there isn't much else out there for GPUs. I refuse to participate in F@H anymore. If you need any info feel free to ask.

Yes you are. Thanks for volunteering. :)

Gilthanis

---

This strongly suggests that the present app would need to be modified to support these GPU's.

That's pretty annoying - it likely means that we'll not be able to use them until CUDA 6 goes public.

Matt

Sorry for being annoying.

---

FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

I bought these cards to run GPUGRID and I'm not to happy that they can't.

Well, it's a new architecture (or more precisely: significantly tweaked and rebalanced) so some "unexpected problems" can almost be expected. Be a bit patient, I'm sure this can be fixed. Maxwell is the new architecture for all upcoming nVidia chips in the next 1 - 2 years, after all.

MrS

---

Scanning for our furry friends since Jan 2002

I bought these cards to run GPUGRID and I'm not to happy that they can't.

Don't worry, support is coming just as soon as possible. These new cards are very exciting for us! Unfortunately, because of the way we build our application, we need to wait for the next version of CUDA which contains explicit Maxwell support.
The other GPU-using projects don't have this limitation because they build their applications in a different way. The other side of that is that they aren't able to make GPU-specific optimisations the way we do.

Matt

Don't worry, support is coming just as soon as possible. These new cards are very exciting for us! Unfortunately, because of the way we build our application, we need to wait for the next version of CUDA which contains explicit Maxwell support.

I hope Nvidia comes out with the new version of CUDA soon. I expect GPUs that use much less electricity will become very popular quickly. I'll be switching back to GPUGRID when you get the Maxwell compatible client out.

The new Haswell E 6-core is available in the Netherlands, but pricy. Any idea when the real Maxwell is launched. I read "soon" on the net in some articles, but did not find any date.

---

Greetings from TJ

The new Haswell E 6-core is available in the Netherlands, but pricy. Any idea when the real Maxwell is launched. I read "soon" on the net in some articles, but did not find any date.

Rumor has it- GTX980 (or whatever board will be called) will be showcased (or released) at NVidia's Game24 event on September 18th, along with a 343 branch driver. GTX 970/960 could be released by early/mid October. Leaked benchmarks (if there not fake) show GM204 Maxwell to be at reference GTX780ti (5teraFlops) performance levels with a lower TDP. Maxwell's Integer/256AES/TMU/ROP performance is higher then Kelper's core. GTX 980 will have 256bit memory interface. Float (double/single) will be similar to a disabled DP core GK110 (GTX780/780ti) cards. A Titan with 64DP core SMX enabled for double precision tasks won't be replaced until another Maxwell stack is created for Titan's market position. A dual Maxwell board with 11/12 single teraflops' and 3/4 Teraflops for double would be an ultimate board.

[/url][/url]

So here is deciding which card would be best for GPUgrid
Boost clock for gtx 980 looks very good, even the 64 ROPS.. But 780Ti have 2880 cuda cores...?

Thanks for this Jozef J.
No hurry for me now to build a new rig as this is still not the "real" Maxwell with the 20nm chip.
Despite more energy used the 780Ti is still the best card to my opinion.

PS: I have a factory overclocked EVGA 780Ti and runs at 1137MHz.

---

Greetings from TJ

So here is deciding which card would be best for GPUgrid
Boost clock for gtx 980 looks very good, even the 64 ROPS.. But 780Ti have 2880 cuda cores...?

The GTX 780Ti is superscalar, so not all of the 2880 CUDA cores can be utilized by the GPUGrid client. The actual number of the utilized CUDA cores of the GTX 780Ti is somewhere between 1920 and 2880 (most likely near the lower end). This could be different for each workunit batch. If they really manufacture the GM204 on 28nm lithography, than this is only a half step towards a new GPU generation. The performance per power ratio will be slightly better of the new GPUs, and (if the data in this chart are correct) I expect the GTX980 could be 15~25% faster than the GTX780Ti (here at GPUGrid). When we'll have the real GPUGrid performance of the GTX980, we'll know how much of the 2880 CUDA cores of the GTX780Ti is actually utilized by the GPUGrid client. But as NVidia choose to move back to scalar architecture, I expect that the superscalar architecture of the Keplers (and the later Fermis) wasn't as successful as expected.

So here is deciding which card would be best for GPUgrid
Boost clock for gtx 980 looks very good, even the 64 ROPS.. But 780Ti have 2880 cuda cores...?

The GTX 780Ti is superscalar, so not all of the 2880 CUDA cores can be utilized by the GPUGrid client. The actual number of the utilized CUDA cores of the GTX 780Ti is somewhere between 1920 and 2880 (most likely near the lower end). This could be different for each workunit batch. If they really manufacture the GM204 on 28nm lithography, than this is only a half step towards a new GPU generation. The performance per power ratio will be slightly better of the new GPUs, and (if the data in this chart are correct) I expect the GTX980 could be 15~25% faster than the GTX780Ti (here at GPUGrid). When we'll have the real GPUGrid performance of the GTX980, we'll know how much of the 2880 CUDA cores of the GTX780Ti is actually utilized by the GPUGrid client. But as NVidia choose to move back to scalar architecture, I expect that the superscalar architecture of the Keplers (and the later Fermis) wasn't as successful as expected.

Is NVidia skipping 20nm for 16nm? After couple years of development, TSMC is struggling badly to find proper Die size(s) for 20nm. Nvidia changes lithography every two years or so. Now after Two and half years, boards are still at 28nm, after three series releases(600,700,800m) of 28nm generations, while GTX980 will be the fourth 28nm released. What could be the problem with finding a pattern to fit cores on 20nm? The change from superscalar to scalar?

How does a 5 SMM, 640core/40TMU/60W-TDP GTX750ti perform (7%~) better than a 4SMX, 768 core/ 110/130W-TDP Kelper with more TMU(64), while smashing GTX650ti/boost compute time/power consumption ratios? Core/memory speed differences'? GTX 750ti is close (~5%) to GTX660 (5SMX/960Core/140w-TDP) compute times. Is Maxwell's cache sub system architecture, TMU rendering that much better than Kelper's, running GPUGRID code? Maxwell's core architecture may be more efficient than Kepler's, but is Maxwell's really more advanced, when Float processing is similar to Kelper? Maxwell Integer performance is higher, due to having more integer cores in SMM vs. SMX, and the added barrel shifter, which is missing in Kepler.

How does a 5 SMM, 640core/40TMU/60W-TDP GTX750ti perform (7%~) better than a 4SMX, 768 core/ 110/130W-TDP Kelper with more TMU(64), while smashing GTX650ti/boost compute time/power consumption ratios? Core/memory speed differences'? GTX 750ti is close (~5%) to GTX660 (5SMX/960Core/140w-TDP) compute times.

That's very easy to answer:
The SMXes of the GTX650Ti and the GTX660 are superscalar, so only (approximately) 2/3rd of their cores can be utilized (512 and 640, respectively).