The 750 Ti is the first Maxwell card, and is much more power efficient than the other 700 series cards.

[QUOTE=Mark Rose;468387]The 750 Ti is the first Maxwell card, and is much more power efficient than the other 700 series cards.[/QUOTE]

I have multiple ways to measure my usage. I have a wall-socket gadget that measures usage, current wattage, and so on. Since the 12th, I have used 56 kWh for two machines At my rate, that $7.28.

This i7 is connected to a APC backup unit. It's software gives the same info and other things. At idle, this one draws 80W. With Prime95 running, it goes to 170W. Use a GPU application, it jumps to nearly 300W. I found a way to throttle one application that would make the APC sound a warning when it went above 330W. I didn't size the unit properly. It should have been higher capacity.

The APC has a rolling day measurement. As of today, it says this machine has used 48.85 kWh in the past month. I will take a guess and say its 'month' is 30 days. Basically, it measures the most recent period. One can also select Day, Week, or Year, from a drop-down menu.

I have an higher-than-average utility bill coming and I have been trying to isolate the source. It has to be the A/C. It's not these two machines.

I have a GTX-750Ti in my i5 HP workstation. When I put it in, I saw where it used to have a power connector on the back of the circuit board. IMHO, they "hobbled" this one to get the consumption down. That entire system is low power. I suppose this is not a bad thing considering that I am running two.

750Ti is a very power-efficient card, but not good for LL or complicated tasks. If you only intend to do TF, or simple tasks, then more of those are better than one "big iron". Actually, the best way to do simple tasks is to have a lot of small, stupid, power efficient toys (see my idea with putting a lot of Cortex Arm MCUs on a PCB).

OMG
 

What does card 2 have to warrant almost 20X the price:

[url]https://www.newegg.ca/Product/Product.aspx?Item=N82E16814932002[/url]
GIGABYTE GeForce GTX 750 Ti DirectX 12 GV-N75TD5-2GI Video Card
$129.99

[url]https://www.newegg.ca/Product/Product.aspx?Item=14-487-025[/url]
GIGABYTE GeForce GTX 750 Ti DirectX 12 GV-N75TD5-2GI 2GB 128-Bit GDDR5 PCI Express 3.0 x16 ATX Video Card
$2,354.97

I mean, I see lots of extra "features" but are they really that valuable?
In any case do I correctly assume as far as GPU-TF goes they are close to equal?

Based on the discussions above I am convinced that the most efficient offering is several GTX-750s rather than 1 GTX-1080. For the same price I can get five 750s with a thruput of about double the 1080 and less power consumption.

Not the bottom end card above but maybe this one:
[url]https://www.newegg.ca/Product/Product.aspx?Item=N82E16814125813[/url]

1st, the 2nd card is EVGA, FWIW.
Here is the EVGA on Amazon:
[url]https://www.amazon.com/EVGA-GeForce-Dual-Link-Graphics-02G-P4-3751-KR/dp/B00IDG3PRI[/url]
Here it is, for $1384.47, in a different NewEgg listing:
[url]https://www.newegg.com/Product/Product.aspx?Item=9SIA4UB20U6062[/url]
My guess is that the 20x price is for a bulk pack.
However, note the seller for the high-priced parts: Sold and Shipped by [URL="https://www.newegg.ca/JResale/about"]JResale[/URL] .
I don't know anything about this seller.
Also, here is a Tom's hardware discussion of the different versions of the 750ti.
[url]http://www.tomshardware.com/answers/id-2475628/difference-gtx-750-models.html[/url]

[QUOTE=petrw1;468606]Based on the discussions above I am convinced that the most efficient offering is several GTX-750s rather than 1 GTX-1080. For the same price I can get five 750s with a thruput of about double the 1080 and less power consumption.[/QUOTE]

Don't forget to factor in the cost of the host systems.

[QUOTE=petrw1;468606]
Based on the discussions above I am convinced that the most efficient offering is several GTX-750s rather than 1 GTX-1080. For the same price I can get five 750s with a thruput of about double the 1080 and less power consumption.[/QUOTE]

I have a GTX 750 Ti. On its best day, it might run 170 GHz-d/Day running a TF. Typical is more like 158. A double-check with it would take eight days, or more. A first-time test in the 80 million range, three weeks.

I am using a GTX 480 on a limited basis. It uses too much power for my suit. So, it will go into a box sometime soon. I [U]will[/U] replace it with a GTX 1080. They draw less wattage and have three times the throughput of what I have now. Of course, that may vary on what I run with it. The "Ti" model would increase my consumption, so it's out!

I would prefer to have the capability with a single GPU, and not five. I've never seen a mobo with that many PCie-16 slots. That leave multiple machines. The operating cost would be ghastly, unless one happens to have a small nuclear reactor in their back yard.

[QUOTE=Madpoo]Don't forget to factor in the cost of the host systems. [/QUOTE]

For five "decent" machines with i5 CPU's and all the other stuff. A guess: $3,000 USD. Something to think about!

[QUOTE=petrw1;468606]
I mean, I see lots of extra "features" but are they really that valuable? In any case do I correctly assume as far as GPU-TF goes they are close to equal?[/QUOTE]

The GTX 750 Ti which Newegg is asking over $2K for is the same exact model I have. It cost $120 USD. That is a major error on their part!

[QUOTE=petrw1;468606]What does card 2 have to warrant almost 20X the price:

[URL]https://www.newegg.ca/Product/Product.aspx?Item=N82E16814932002[/URL]
GIGABYTE GeForce GTX 750 Ti DirectX 12 GV-N75TD5-2GI Video Card
$129.99

[URL]https://www.newegg.ca/Product/Product.aspx?Item=14-487-025[/URL]
GIGABYTE GeForce GTX 750 Ti DirectX 12 GV-N75TD5-2GI 2GB 128-Bit GDDR5 PCI Express 3.0 x16 ATX Video Card
$2,354.97

[/QUOTE]
Nothing. It is the same card, different cooler, plus a "clever" guy waiting for a stupid customer. The card can't be more expensive than $150 or so, and in fact, it [U]does[/U] have that price on [URL="https://www.evga.com/products/productlist.aspx?type=0&family=GeForce+700+Series+Family&chipset=GTX+750+Ti"]EVGA site[/URL].

[QUOTE=storm5510;468629]For five "decent" machines with i5 CPU's and all the other stuff. A guess: $3,000 USD. Something to think about!
[/QUOTE]
Make that two. Any low-mid range mobo has 2-3 PCIe slots at least 4x or 8x. For 5 cards you need either two mobos like that, or one big iron like the x99e-ws, to which you can mount 7 cards max (but the price for the mobo only is ~$600, to which you have to add for an x99 cpu, it may get even more expensive, but that is another story).

[QUOTE=storm5510;468629]I have a GTX 750 Ti. On its best day, it might run 170 GHz-d/Day running a TF.

I would prefer to have the capability with a single GPU, and not five. I've never seen a mobo with that many PCie-16 slots. That leave multiple machines. The operating cost would be ghastly, unless one happens to have a small nuclear reactor in their back yard.

For five "decent" machines with i5 CPU's and all the other stuff. A guess: $3,000 USD. Something to think about!
[/QUOTE]
For several years now I have had 5 PC's all full time GIMPS.
This "farm" took a few years to grow. Whenever I needed a new main PC (the one the wife uses) I moved the old PC downstairs to the No-Girls-Allowed GIMPS Man-cave.

I have a 4 port KVM switch in the basement so that is my self imposed limit (and to keep my nuclear reactor from overheating).

In a few cases I bought a cheap used PC from the forum or built one with parts to replace a really old virtually useless PC.

In that time I also got a GPU in 2 of them; one (GTX-750) was part of the build and one (GTX-780) was from a member.

I really wanted a GTX-1080 next but now that I realize the relative power consumption of various GPUs I have to rethink my plans. Here are the facts.

1. My GTX-750 died a few weeks ago after limping along with stuck fans for a month.
2. My GTX-780 is using about 4 times the power but only doing about 15% more work.
3. The GTX-1080 appears to use the same power as the GTX-780 but doing about twice the work of it.
4. My main PC is due to be replaced this fall.

So my thinking is:
1. Replace dead GTX-750 with another GTX-750.
2. Replace working GTX-780 with a GTX-750. (It will pay for itself in about 8 months in saved power).
3. Buy a new main PC with a GTX-750 (I might cave in and get the GTX-1080Ti here)
4. Move the current main PC downstairs and retire the oldest.

Looking at this chart:
[url]http://www.mersenne.ca/mfaktc.php?sort=jvr2[/url]

The GTX-750Ti is showing about 325 GHzD/day yet I am getting about 500. Anyone else?

I don't remember the exact model but I know it is an extreme gaming edition; brand name Windforce and it has 3 fans. Based on this it may be over powered and may be using more than the advertised 60 watts in the chart.

It also makes me nervous that if I buy another GTX-750Ti it may be a 325 GhzD/Day (or less) and not a 500 model; though it may use less power.

I also notice that a few others on the chart with low wattage and decent thruput:
GTX-1060M
GTX-965M (Not on NewEgg)
GTX-950

[QUOTE=petrw1;468650]It also makes me nervous that if I buy another GTX-750Ti it may be a 325 GhzD/Day (or less) and not a 500 model; though it may use less power.[/QUOTE]

You're looking at the wrong column. It is showing 139.7 GDay/day. Are you sure you are getting 500 GDay/day from 750? (In fact, even the 780 is showing as 348.9 GDay/day -- maybe a 780 Ti).

You should consider 10xx series for your upgrades.