Will a GTX750Ti (2GB) run without anything connected to the 6-pin power connector if I don't try to make it run faster than usual?

I bought one and tried to install it, but found that the computer doesn't have any power connectors that aren't already in use.

Do you know of any source of power cable splitters that would allow me to have a hard disk and the GTX750Ti share a power cable from the PSU? Probably also a few extenders for such power cables. Needs to be a source that will ship to the US.

My Asus GTX 750 Tis will not run at all without the PCIe power cable connected. There is an LED on the card that stays red until you plug it in, and then it turns green.

Newegg has lots of PCIe power adapters.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=pcie+power+adapter&N=-1&isNodeId=1

Not sure about installing the GPU without using a 6-pin connector, but in theory it should work. Until you started crunching it would not need much power and you could always power cap it using MSI Afterburner (or similar) before launching Boinc.

You would need 2 free molex sockets for this,
http://www.amazon.com/StarTech-com-6-Inch-Express-Adapter-LP4PCIEXADAP/dp/B0007RXDDM/ref=sr_1_1?s=electronics&ie=UTF8&qid=1421399317&sr=1-1&keywords=molex+to+6-pin

That may be PART of a solution. There are no free molex sockets.

After writing my request, I decided to check newegg.com and found that they have enough variety in their internal power cables and adapters that I may be able to put together a five-part solution from items they sell, after I check the computer again to make sure what type of connectors are used on the hard drive power cables.

Will a GTX750Ti (2GB) run without anything connected to the 6-pin power connector if I don't try to make it run faster than usual?

I've been running an EVGA 750ti for three months. It's the non-factory OCed version and it does not have an additional power connection.

I OCed it to the level of the factory OCed version and it's happy, 24/7. it runs at a constant 72C.

Updated with the GTX960 (approximate values):

Performance	GPU			Power	GPUGrid Performance/Watt
211%    	GTX Titan Z (both GPUs)	375W	141%
116% 		GTX 690 (both GPUs)	300W	97%
114%    	GTX Titan Black		250W	114%
112%    	GTX 780Ti		250W	112%
109%		GTX 980			165W	165%		
100%		GTX Titan		250W	100%
93%		GTX 970			145W	160%		
90%		GTX 780			250W	90%
77% 		GTX 770			230W	84%
74% 		GTX 680			195W	95%
64% 		GTX 960 		120W	134%
59% 		GTX 670			170W	87%
55% 		GTX 660Ti		150W	92%
53%		GTX 760 		130W	102%
51% 		GTX 660			140W	91%
47%     	GTX 750Ti		60W	196%
43% 		GTX 650TiBoost		134W	80%
37% 		GTX 750			55W	168%
33%		GTX 650Ti		110W	75%

Throughput performances and Performances/Watt are relative to a GTX Titan.
Note that these are estimates and that I’ve presumed Power to be the TDP as most cards boost to around that, for at least some tasks here.
I don’t have a full range or cards to test against every app version or OS so some of this is based on presumptions based on consistent range observations of other cards. I’ve never had a GTX750Ti, GTX750, 690, 780, 780Ti or any of the Titan range to compare, but I have read what others report. While I could have simply listed the GFLOPS/Watt for each card that would only be theoretical and ignores discussed bottlenecks (for here) such as the MCU load, which differs by series.

The GTX900 series cards can be tuned A LOT - either for maximum throughput or less power usage / coolness / performance per Watt:
For example, with a GTX970 at ~108% TDP (157W) I can run @1342MHz GPU and 3600MHz GDDR or at ~60% TDP (87W) I can run at ~1050MHz and 3000MHz GDDR, 1.006V (175W at the wall with an i7 crunching CPU work on 6 cores).
The former does more work, is ~9% faster than stock.
The latter is more energy efficient, uses 60% stock power but does ~ 16% less work than stock or ~25% less than with OC'ed settings.
At 60% power but ~84% performance the 970 would be 34% more efficient in terms of performance/Watt. On the above table that would be ~214% the performance/Watt efficiency of a Titan.

I expected the 750Ti and 750 Maxwell's also boost further/use more power than their reference specs suggest, but Beyond pointed out that although they do auto-boost they don't use any more power for here (60W). It's likely that they can also be underclocked for better performance/Watt, coolness or to use less power.

The GTX960 should also be very adaptable towards throughput or performance/Watt.

PM me with errors/ corrections.

---

FAQ's

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

Thanks for this update skgiven :)

---

[CSF] Thomas H.V. Dupont
Founder of the team CRUNCHERS SANS FRONTIERES 2.0
www.crunchersansfrontieres

BOINC has a strange way of calculating performance computing.

The theoretical power is calculated this way: Shaders X Shader Clock x 2 (Because ADD + MADD)

For example GTX 280: 240 x 1296 x 2 = 622,080 FLOPs => 622.08 GFLOPS
GTX 580: 512 x 1544 x 2 = 1581056 FLOPs => 1581.056 GFLOPS
GTX 780 Ti: 2880 x 925 x 2 = 5328000 FLOPs => 5328 GFLOPS

For Radeon (Because AMD OpenCL GPU):

Radeon HD5870 320 (5D) x 850 x 2 x 5 = 2,720 GFLOPS (5 for 5 vector instructions)
Radeon HD6970 384 (4D) x 880 x 2 x 4 = 2703.36 GFLOPS
Radeon HD7970: 2048 x 1050 x 2 = 4096 GFLOPS (Scalar architecture)
Radeon R9 290x: 2816 x 1000 x 2 = 5632 GFLOPS

The single-width Galaxy GTX 750 Ti Razor is a new one on me!

My mobo has six PCIe slots, and with two double-width GPUs installed I have two spare single slots. Or perhaps I should sell my two GPUs and install six of these??!!

I don't find them on sale Stateside, neither amazon.com nor newegg.com, but amazon UK and France have them, albeit quite expensive.

Any experience of this GPU out there?

The single-width Galaxy GTX 750 Ti Razor is a new one on me!

My mobo has six PCIe slots, and with two double-width GPUs installed I have two spare single slots. Or perhaps I should sell my two GPUs and install six of these??!!

I don't find them on sale Stateside, neither amazon.com nor newegg.com, but amazon UK and France have them, albeit quite expensive.

Any experience of this GPU out there?

I have no experience with them, but something you should check: Is there adequate space between the single slots that all 6 cards can get adequate air for cooling?

Also, this card appears to be designed to blow air around within the case, rather than blowing it out of the case. Graphics cards designed that way tend to run hotter.

Just picked up an EVGA GTX 750 Ti FTW for this host and I'm really impressed with it so far. The boost clock is running at 1320MHz and on one of the current GERARD_CXCL12 Long WUs it's at 42C (default fan curve) at 88% GPU Usage and ~67% GPU Power. I keep a window in that room open just a little (it's -20C outside), but even when that room is warmed up I have yet to see the card hit 50C.

I'm using rough numbers, but it seems that this card may be at least twice as energy efficient as my 780 Ti Superclocked cards.

skgiven:

Thanks for putting together this reference chart, and keeping it up to date. It helped me make a decision on my purchase (below).

I currently have 3 GPUs in the rig:
GTX 660 Ti - eVGA 3GB FTW
GTX 660 Ti - MSI 3GB N660TI TF 3GD5/OC
GTX 460 - eVGA 1GB SC

I'll be pulling the GTX 460 out, and replacing it with...
GTX 970 - eVGA 4GB FTW ACX 2.0 04G-P4-2978-KR
http://www.amazon.com/gp/product/B00OSS0AG4/
$369.99
... for better GPUGrid capabilities, for better performance in iRacing, and to better support my next purchase, the Oculus Rift DK2. I know about the 3.5 GB memory oddity, and I also know that there's a "FTW+" card, but it requires an 8-pin that I can't supply. :) I'm already tapped out with 4 real 6-pins, and 2 other 6-pins made from 4 molexs. Pushing 860 watts, 24/7, on a 5-year-old 1000 watt supply, in a 5-year-old Dell XPS 730x... is fun!

Thanks again for helping me decide,
Jacob

I've been deploying 750ti and 750 cards of late. I also have a couple of 650 leftovers in the mix.

I like the price/performance/power combination for the 750ti and 750.

It seems anything with more performance costs quite a bit more AND requires significantly more power to run.

In a number of my set ups, I've been upgrading older systems running HD 4850's with the 750TI which has shifted me from Moowrap and Milkyway to GPUGrid -- it has also resulted in a lower power load (120W versus 80W).

Due to the single slot requirement in one of my computers, I have spotted this card:

Gainward GeForce GTX 750 (Single-Slot), 2GB GDDR5

Shader-Units/TMUs/ROPs: 512/32/16 • Computing: 1044GFLOPS (Single), 33GFLOPS (Double)

In view of what I have read above, it would seem to be a good choice for grid computing, am I right?
I guess this card can be overclocked?

sorry, folks, for my numerous postings with same content. There was a technical problem.

sorry again for my multiple postings - now idea what my browser is doing with me

Can happen sometimes, no worries. Skgiven or ETA can remove them.

Edit it took 4 minutes to post this message. Such a slow forum can cause these multiple posts.
Edit 2 and the Edit in just a second....

---

Greetings from TJ

The slow posting may be left overs from the disconnect yesterday.

I am still seeing slow response from this site.

That could be a case of backlog with folks reporting in previously completed work and grabbing new work.

Or it *could* be something of an ongoing and unresolved 'pipeline' issue.

I've seen no comment regarding this from the admin folks though.

sorry, folks, for my numerous postings with same content. There was a technical problem.

sorry again for my multiple postings - now idea what my browser is doing with me

Can happen sometimes, no worries. Skgiven or ETA can remove them.

Edit it took 4 minutes to post this message. Such a slow forum can cause these multiple posts.
Edit 2 and the Edit in just a second....

Updated with the GTX Titan X (estimated values based on limited results):

Performance	GPU			Power	GPUGrid Performance/Watt
211%    	GTX Titan Z (both GPUs)	375W	141%
156%    	GTX Titan X             250W	156%
116% 		GTX 690 (both GPUs)	300W	97%
114%    	GTX Titan Black		250W	114%
112%    	GTX 780Ti		250W	112%
109%		GTX 980			165W	165%		
100%		GTX Titan		250W	100%
93%		GTX 970			145W	160%		
90%		GTX 780			250W	90%
77% 		GTX 770			230W	84%
74% 		GTX 680			195W	95%
64% 		GTX 960 		120W	134%
59% 		GTX 670			170W	87%
55% 		GTX 660Ti		150W	92%
53%		GTX 760 		130W	102%
51% 		GTX 660			140W	91%
47%     	GTX 750Ti		60W	196%
43% 		GTX 650TiBoost		134W	80%
37% 		GTX 750			55W	168%
33%		GTX 650Ti		110W	75%

Throughput performances and Performances/Watt are relative to a GTX Titan.
Note that these are estimates and that I’ve presumed Power to be the TDP as most cards boost to around that, for at least some tasks here.
I don’t have a full range or cards to test against every app version or OS so some of this is based on presumptions based on consistent range observations of other cards. I’ve never had a GTX750Ti, GTX750, 690, 780, 780Ti or any of the Titan range to compare, but I have read what others report. While I could have simply listed the GFLOPS/Watt for each card that would only be theoretical and ignores discussed bottlenecks (for here) such as the MCU load, which differs by series.

The GTX900 series cards can be tuned A LOT - either for maximum throughput or less power usage / coolness / performance per Watt:
For example, with a GTX970 at ~108% TDP (157W) I can run @1342MHz GPU and 3600MHz GDDR or at ~60% TDP (87W) I can run at ~1050MHz and 3000MHz GDDR, 1.006V (175W at the wall with an i7 crunching CPU work on 6 cores).
The former does more work, is ~9% faster than stock.
The latter is more energy efficient, uses 60% stock power but does ~ 16% less work than stock or ~25% less than with OC'ed settings.
At 60% power but ~84% performance the 970 would be 34% more efficient in terms of performance/Watt. On the above table that would be ~214% the performance/Watt efficiency of a Titan.

I expected the 750Ti and 750 Maxwell's also boost further/use more power than their reference specs suggest, but Beyond pointed out that although they do auto-boost they don't use any more power for here (60W). It's likely that they can also be underclocked for better performance/Watt, coolness or to use less power.

The GTX960 should also be very adaptable towards throughput or performance/Watt.

PM me with errors/ corrections.

---

FAQ's

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

Thanks for this update skgiven :)

---

[CSF] Thomas H.V. Dupont
Founder of the team CRUNCHERS SANS FRONTIERES 2.0
www.crunchersansfrontieres

Hi skgiven,

Thanks for the update. I note that the 750Ti continues to perform 4% points behind the 660.

That does not reflect my experience...

I've logged all my completed WUs for over a year now and one of the items I calculate is credits per run-time hour. I've just done an analysis of my 750Ti vs. my 660 since the start of this year. The 750Ti sits in my AMD 8-core main rig with a 770, and is connected to video. The 660 sits undisturbed, upstairs, in a Pentium 8-core. The numbers are:



So my 750Ti is marginally better than my 660, not 4% points worse.

Hi:

This is still running after 24h:36m - 72.5%, with 8h:06m still to run on my GTX650Ti......

Is this abnormal?

Thanks

Task
click for details
Show names Work unit
click for details Computer Sent Time reported
or deadline
explain Status Run time
(sec) CPU time
(sec) Credit Application
14103116 10868065 190176 12 Apr 2015 | 10:11:00 UTC 17 Apr 2015 | 10:11:00 UTC In progress --- --- --- Long runs (8-12 hours on fastest card) v8.47 (cuda65)

No it's perfectly normal. These are very long units and I would say any card below a 660 or 660ti would not finish within 24hrs

This is still running after 24h:36m - 72.5%, with 8h:06m still to run on my GTX650Ti......

Is this abnormal?

You're asking in the wrong thread.
These are fairly long workunits, so it's normal that these take more than 24h on a GTX650Ti.