I've got budget to replace one of my gpugrid cards. Are the "lower end" Titans a viable card for gpugrid tasks?

Currently the 780ti is an excellent choice for this project. These cards crunching GPUGRID tasks, given all things being equal and the same (performance tasks at other projects may differ), will out perform a TITAN, however the TITAN Black editions will outperform the 780ti. Given the cost and performance difference between the 780ti and the TITAN Black, the 780ti would be the better choice.

Agreed. The cost-benefit ratio for the 780Ti is much better than for either Titan.

my box has a single gpu slot.

Should I get one slightly used 690 or one new 780ti?

my box has a single gpu slot.

Should I get one slightly used 690 or one new 780ti?

my box has a single gpu slot.

Should I get one slightly used 690 or one new 780ti?

interesting, Retvari,

How is the 780Ti more "future proof"?

Shouldn't the 690 process approximately twice as many WU's per unit of time than a single 780Ti?

Teach me, please!

As stated... a GTX 690 has 2x1536 (3072) cores operating at 1019-1058 Boost Mhz at 300 Watts TDP, whereas a GTX 780 Ti has 2880 cores operating at ~928 Boost Mhz at 250 Watts TDP.

So... from what I gather:
The GTX 690 is basically like 2 GPUs, each with 1536 cores.
The GTX 780 Ti is basically like 1 GPU, with 2880 cores.

So...

The GTX 690 will do 2 work units at the same time, and get them both done in like 12 hours. So, each work unit takes 12 hours, but because it got 2 done in that time, it processes at an overall rate of 6 hours per work unit.

The GTX 780 Ti will only do 1 work unit at a time, and will get one done in something like 7 hours; it processes at a rate of 7 hours per work unit.

Note: These numbers are made-up; they're just demonstrating how the GTX 690 does work in parallel (getting a higher overall throughput), whereas the GTX 780 Ti does work in serial (getting a single work unit done faster, but at a slower overall throughput).

The GTX 690's throughput is not twice the GTX 780 Ti; it's likely only a bit better.

Want more made-up numbers?
GTX 690: 3072cores * 1058Mhz = 3,250,176
GTX 780Ti: 2880cores * 928Mhz = 2,672,640
... so, the GTX 690 has ((3,250,176 / 2,672,640) - 1) = 21.6% more throughput, theoretically.

one should always run 2 WUs per card to take advantage of 10% idle time while CPU is doing something.
Also you want to downclock memory as much as possible for GPUGRID since it's not memory intensive, so the card can boost it's base clock without exceeding power limit.
Example: 1 WU on my older titan uses 95% base power at 1058Mhz core, 6000Mhz memory.
2 WUs hit power limit and use about 99% at 1032Mhz core (but still 2 WUs at the same time finish faster than if they are processed serially).
2 WUs with memory downclocked to 5000Mhz use 97% power at 1058core - and finish even faster than in 1032/6000 case.

I do have some EVGA titan with 868 base core that goes up to 1058 core if within power/temp specs.

Why not just raise the Power Target %, and then force Max Boost (using nVidiaInspector; I posted a thread about it)? That's what I do on my Keplers, to keep them running full steam.

Ken,

I have two 780Ti cards running in Win7. One maxes out at 1124MHz and the other at 1137MHz.

Here are some recent run-times.

I also typically run 5 World Community Grid tasks at a time while doing GPUGrid, so that slows my GPU times just a little bit (reduces my GPU utilization by about 3% - 5%).

Thanks to all!

Recently I have made new PC for gpugrid and I have tried 4x 750ti:

- with longruns only credit is about 900k daily
- power consumption with full load is 300w

A dual GTX 780 Ti system would also cost more to build.

Recently I have made new PC for gpugrid and I have tried 4x 750ti:

- with longruns only credit is about 900k daily
- power consumption with full load is 300w

However, I think these cards don't have their own PCIe power connector, so all of the current needed by them is going through the motherboard's PCIe connectors.

Many GTX750Ti's have a 6-pin power connector,

A long time ago I had four GT240's in the one system (69W TDP each). The GPU's didn't have their own Power connector. The motherboard had an additional power connector (might have been Molex, but some have a 6-pin PCIE connector and or an extra 8-pin power connector),

Look just above the top PCIE slot, and just above the CPU.

Best for a single slot would probably be a dual GPU Titan Z, though I loath the damn thing and NVIDIA for having the audacity to try and sell it due to its exceedingly ludicrous price point, having lower performance than two Titan Blacks but costing a half again more (1000 USD) than their combined price. It's better just to build another computer and get another card for it at that point.

My computer setup is optimized for 2-way SLIed cards with each card having 16 PCIe gen. 3 lanes.

My two EVGA Titan Black Superclocked Cards together (each running one work unit at a time) at stock boost clocks and power targets while being on average about 75% loaded each are so far (I started crunching for GPUGrid this last weekend) averaging about 1 million credits a day exclusively for GPUGrid. (Amazingly, this is about 20 times the amount of credit I was getting per day with the other projects I crunch for before dedicating my GPUs to GPUGrid.)

1 GPUGrid tast per card seems well enough for me, though I could push it to run more. I want to keep my cards cooler and not have them stressed as much. This way I can also game, etc. at the same time too without changing any BOINC settings around.
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My BOINC Cruncher, Minecraft Multiserver, Mobile Device Mainframe, and Home Entertainment System/Workstation: http://www.overclock.net/lists/display/view/id/4678036#

Just to help clarify: The Titan Z is essentially the same exact thing as two underclocked Titan Blacks on one card, though as mentioned, for half again more the price.

Anyway... yes, of the Titan style of NVIDIA cards out there (in all but name, memory capacity, and double precision performance - which are all essentially irrelevant as far as GPUGrid is concerned), the 780 Ti cards are among the most powerful and cost effective.

To put this in perspective: Someone could potentially get four 780 Ti cards and have more than double the performance of a Titan Z while paying about 200 USD less overall.
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My BOINC Cruncher, Minecraft Multiserver, Mobile Device Mainframe, and Home Entertainment System/Workstation: http://www.overclock.net/lists/display/view/id/4678036#