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GTX 750 Ti mining - Page 37

post #361 of 1291
So people, regarding the GA-990FXA-UD3 I can definitely confirm that *some* of these boards have an issue where they just WILL NOT work with more than 4 cards. I have one out of the batch of them I bought so far with this issue. Will be returning it. I'm wondering if the UD5 has the same issue?

I'll report back on how many of these I bought that will not do more than 4 cards. So far I have 2 working and 1 not working.
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post #362 of 1291
Quote:
Originally Posted by Freekers View Post

My 6 card Gigabyte 750ti rig has been running for 48 hours now without any major issues (cudaminer crashed once,so I lowered overclock on the memory by 10 Mhz).





I used a foldable plastic shopping crate as case. I put the mainboard in the box it came in and cut off the top.

As discussed before, (powered) risers have quite an impact on memory clock speeds and kh/s. I had to lower the memory clock by 200Mhz on my 6 card setup and my hashrate dropped by about 20-25 kh/s per card.
Currently I'm getting 1780 kh/s at 550Watts (measured at the wall) using these arguments: -l T10x24 -C 1 -i 0 -m 1. T5x24 yields the same results as does it without the -m 1 parameter. This is with an overclock of +135/+425 per card.
Without overclock I get 1550 kh/s at 490 Watts, so for me the OC is definitely worth it (in contrary to the guys over at the cryptomining blog, which have exactly the same setup).

Try -H 2 too.
Quote:
Originally Posted by Aurosonic View Post

I've just beat 1800khs with 6xmsi 750ti tf. Will post my setup tomorrow wink.gif

Amazing! I wanted to get those but they don't sell em here yet.

Selling a used 6950 to buy a 750ti (almost the same $$$ lol)

Btw, anyone tried THIS?

I contacted the CryptoSlax developer to see if he could make an Nvidia based release, he said he'd look into it soon. biggrin.gif
post #363 of 1291
Quote:
Originally Posted by ivanlabrie View Post

Try -H 2 too.
Amazing! I wanted to get those but they don't sell em here yet.

Selling a used 6950 to buy a 750ti (almost the same $$$ lol)

Btw, anyone tried THIS?

I contacted the CryptoSlax developer to see if he could make an Nvidia based release, he said he'd look into it soon. biggrin.gif

Cool, looks like a BAMT for Nvidia cards!
post #364 of 1291
Quote:
Originally Posted by 79cj7jeep View Post

I have 5 rigs total. All the same rev. 4 of the 990fxa mobo, same bios, same memory, same processor.

Two of the 5 rigs have 6x MSI 750 ti cards in them and work flawlessly, I did not have to change a single setting in the bios, etc. Just loaded windows, loaded drivers, loaded cudaminer and instant joy.

The three remaining rigs have 6 x PNY 750 ti cards in them. One of them works flawlessly, and again, had no issues loading things and getting it working. The remaining two rigs with the PNY's - cards #4 & #5 are recognized, drivers load fine, but for some (unknown to me) reason, cards #4 and #5 are producing 30-40% of what all of the other cards are producing (I'm mining VTC, so good hash on the other cards is 130-135K, whereas the #4 and #5 on the two rigs with issues are running like 40K-90K).

That all being said..

#1. You can absolutely run AT LEAST 6 x 750 ti cards in windows 7. That myth can officially RIP.
#2. The Gigabyte 990FXA mobo can absolutely run 6 x 750 ti cards at full speed, under windows 7, no issues. That myth can officially RIP.
#3. I have no idea how to resolve the issue with card slots #4 & #5. It's not the cards - swapped them around just to be sure, but no matter which card is plugged in to which slot, it's always the cards that show up in cudaminer as #4 and #5 (six total - 0,1,2,3,4,5) that are the issue.

Finally got it all sorted - I'm now 5 for 5 rigs each with GA-990FXA-UD3 mobo's and each with 6 x 750 ti cards running full speed: W00T! tongue.gif
post #365 of 1291
Quote:
Originally Posted by 79cj7jeep View Post

Finally got it all sorted - I'm now 5 for 5 rigs each with GA-990FXA-UD3 mobo's and each with 6 x 750 ti cards running full speed: W00T! tongue.gif

so how did you fix it ? because I have 1 mobo out of 4 so far that works right, 1 of them won't work with more than 4 cards, the others get terrible hash. I did realize one thing though -- the rig I have that works perfectly, 1700 khash for 6 cards. Has an fx4100 in it, the rigs that don't work have semprons.... Im gonna swap the fx4100 into a non working board tomorrow to see if processor power is the problem.

What processor are you using on all of them btw?

It's really odd that this would happen unless it is infact processor power to blame, since these mobos *should* be identical... I'm wondering if the ud5 has these issues i'm gonna have to rma all of them to amazon except the working one likely.
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post #366 of 1291
Are the GTX 750s and Tis worth it in terms of overall cost / performance?

I mean you get competitive hash rates at less power draw, but you still have to pay for the mobo, CPU, and harddrive.

I see a GTX 750 for $125 and not sure if 3 of them is better than a R9 280X.
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post #367 of 1291
Okay so processor doesn't make a difference, I just swapped the working mobo from having a 4100 to a sempron and hash is the exact same. These mobos are just garbage.
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post #368 of 1291
Sempron 145's in each, 4GB 1600 in each.

For me, the solution was simple. The PCI risers were to blame. I actually have 3 different types of risers - all 1x to 16x powered risers, but first batch is ribbon cable, and the other two batches are USB 3.0 style. For whatever reason, ONLY the ribbon style work in the two 1x slots. If I use the usb style in the 1x slots, although windows recognizes it, the hashes are terrible. Once I swapped my riser cables around so that the ribbon style were used for the 1x slots, 100% hash rates on all cards in each rig. 810k + from each rig VTC, no overclocking, each card ~ 52-54 degrees. Each rig pulling ~4.05 amps at the wall.

Curious to see if/when cudaminer is tweaked with maxwell optimizations, should squeeze out even more.
post #369 of 1291
Quote:
Originally Posted by 79cj7jeep View Post

Sempron 145's in each, 4GB 1600 in each.

For me, the solution was simple. The PCI risers were to blame. I actually have 3 different types of risers - all 1x to 16x powered risers, but first batch is ribbon cable, and the other two batches are USB 3.0 style. For whatever reason, ONLY the ribbon style work in the two 1x slots. If I use the usb style in the 1x slots, although windows recognizes it, the hashes are terrible. Once I swapped my riser cables around so that the ribbon style were used for the 1x slots, 100% hash rates on all cards in each rig. 810k + from each rig VTC, no overclocking, each card ~ 52-54 degrees. Each rig pulling ~4.05 amps at the wall.

Curious to see if/when cudaminer is tweaked with maxwell optimizations, should squeeze out even more.

That is very odd....... I only have 1 or 2 ribbons left at this point.

Well im not gonna deal with this crap, Ill just RMA these and order 5x of the UD5 model and if it has the same issues ill just go to the asrock 970 extreme 4's or the gigabyte 970 whatevers I have running 5 cards on 7 rigs no problem. Maybe 6 cards per mobo is just too much trouble >

Yeah I just read up the UD5 is a piece of junk too. Gonna look around for a good quality 6 slot Am3+ mobo or just do what I said above.
Edited by HardwareDecoder - 3/8/14 at 8:11pm
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post #370 of 1291
Quote:
Originally Posted by LiveSideways View Post

Have any of you guys used the EVGA GTX 750 SC cards? Non-TIs? I grabbed one @ $109 after rebate the other day and it's been chugging along at 255kh/s with ZERO overclocking on my end and I haven't even set any customs launch parameters for cudaminer haha.

Just wondering because it seems like the TI's are all ~$150+ and even taking into account huge OC's you're only gaining ~30-50kh/s tops.

I'm no mathematician but wouldn't that mean - The card is ~2/3 the price yet makes ~3/4 or better KH/s?

I am very interested to hear more about the 750s. Looking to replace a few more AMD cards and if there is any more gas left in the tank they'd be a steal at $110-120.

My experience with the 750tis so far has been stellar. After learning of the 750ti's power and hashing characteristics last weekend, I decided to order 5 of them to see if they would serve as a suitable replacement for a rig I had running 4x Radeon 6950s. The 6950s were extremely hot and power hogs, so I was hashing at less than 1500kh/s with the four of them just to keep temps under control. I figured if I liked the 750tis, 5 of them would probably work out better than the 6950s. And I must say I'm blown away!

I went with 5 of the EVGA SC models - the non-FTWs. I'm running them on a Gigabyte 970A-DS3P - 2 on 16x risers and the other three on 1x-16x powered ribbon risers. They run easily on an 850w PC Power & Cooling PSU I had running 3 of the 6950s. the loudest fan by far is the annoying AMD CPU box fan. I am testing OC at the moment but right now I am within 1-2% of 1500kh/s for the set with them running at +50/+450. Still tweaking so hopefully I can get some more out of them. GPU 0 is running at 63 degrees but the rest are well under 60. I am extremely pleased with these compared to the 6950s. Now if I can get that CPU fan to stop whining, I'll have an almost-silent 1500kh/s rig that's probably using 500w or so.
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