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GTX 750 Ti mining - Page 55

post #541 of 1291
Quote:
Originally Posted by MetalPhreak View Post

Running 6x Gigabyte GTX750Ti OC cards on an Asrock PRO BTC board here. Using the USB3 powered risers for all 6. I haven't modified the BIOS so the stock limit still applies. At the moment I just have +180 core and +400 mem set in MSI Afterburner (gigabyte OC Guru is limited to 5 cards...). That's 6200MHz memclock. The power limiter seems to keep the core clock in check anyway, so I don't think it's ever actually getting to +180 core. With chrome open, I'm getting *just* under 300kh/s per card.

PSU is an In Win Commander II 1200W (overkill for this, but I had one spare). It's 80+ Bronze rated so ~85% efficiency on 240V supply. Idle is 65-70W and full load is 450W. Works out to 54W of actual DC power draw for each GPU plus whatever the tiny idle amount is.

Could you please detail ("for dummies" style) how did you powered the GPUs?
I'd like to know, for each GPU and riser, where the power is coming from and which adapters are you using?

@all,
Can the MOBO SATA connectors power risers? Or can I only use the PSU?

Thanks in advance... rolleyes.gif
Edited by RavenXBR - 3/15/14 at 8:56am
post #542 of 1291
PCI-E 6-pin to each GPU. Molex power to each riser using SATA to Molex adapters.

If your cards don't have PCI-E 6pin connectors, you'll need to make sure you use separate cable chains to power pairs of risers. Don't run all 6 cards off the same cable from the PSU!
post #543 of 1291
Quote:
Originally Posted by MetalPhreak View Post

PCI-E 6-pin to each GPU. Molex power to each riser using SATA to Molex adapters.

If your cards don't have PCI-E 6pin connectors, you'll need to make sure you use separate cable chains to power pairs of risers. Don't run all 6 cards off the same cable from the PSU!

I have the same card as yours (only 1 by now, but studying to buy more).

Supposing I'm going to use this PSU:




1) PCI-E 6-pin to each GPU

Can I use this setup?
- 3 PCI-E 6 pin cable directly from PSU
- 3 Molex cable + PCI-E 6 pin adapter directly from PSU. Can I use this kind of adapter in this case?




2) Molex power to each riser using SATA to Molex adapters

Only 1 modular connector is left by now on the PSU. So, where I would find 5 more?


Thanks in advance.
Edited by RavenXBR - 3/15/14 at 9:48am
post #544 of 1291
so which GTX is the best?

I see the EVGA (One fan design) for 169.99, the ASUS (two fan design) for 179.99 and the MSI TF one for 189.99

I plan on buying 5-6 cards and installing them into my As Rock BTC board. I plan on using powered risers, but I won't actually connect the power cables.


EVGA has the highest memory of them all, but if my non reference ASUS R9 290 has taught me anything, is that core clock doesn't always improve hashrate. (Need a Core of 880 to get decent kh/s)
post #545 of 1291
Quote:
Originally Posted by Roy360 View Post

I plan on buying 5-6 cards and installing them into my As Rock BTC board. I plan on using powered risers, but I won't actually connect the power cables.

What kind of risers are we talking about? If it's USB-risers then you will have to power them, there's no choice. The cards won't start up otherwise.
 
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post #546 of 1291
Quote:
Originally Posted by HothBase View Post

What kind of risers are we talking about? If it's USB-risers then you will have to power them, there's no choice. The cards won't start up otherwise.

they are the cheap molex ones you can find on eBay for 10$. The 12V lines are still in them, so they will power even if their molex connection isn't connected.


http://www.ebay.ca/itm/131036174019?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
post #547 of 1291
Quote:
Originally Posted by AlphaC View Post

It may be because the VRAM used is Hynix BFR
(see http://www.overclock.net/t/1468166/gtx-750-ti-mining/100#post_21878424)

what's likely the issue is they are set to run at 1.35V by default = 5 Ghz

I'm going to try them on another board with BAMT and see if I can push the khash up a bit. I did manage to get to 595 together, but it was pulling 75W each from the wall so it's not worth that extra bump at all.
Quote:
Originally Posted by Roy360 View Post

so which GTX is the best?

I see the EVGA (One fan design) for 169.99, the ASUS (two fan design) for 179.99 and the MSI TF one for 189.99

I plan on buying 5-6 cards and installing them into my As Rock BTC board. I plan on using powered risers, but I won't actually connect the power cables.


EVGA has the highest memory of them all, but if my non reference ASUS R9 290 has taught me anything, is that core clock doesn't always improve hashrate. (Need a Core of 880 to get decent kh/s)

My 780's can get a 13mhz core increase and improve my hash rates around 7-8khash if I decrease my mem clock by 240mhz.

I really am hoping to see a cudaminer update that's going to help out scrypt based coins, very very soon!!
Edited by xartic1 - 3/15/14 at 6:31pm
post #548 of 1291
Quote:
Originally Posted by Roy360 View Post

so which GTX is the best?

I see the EVGA (One fan design) for 169.99, the ASUS (two fan design) for 179.99 and the MSI TF one for 189.99

I plan on buying 5-6 cards and installing them into my As Rock BTC board. I plan on using powered risers, but I won't actually connect the power cables.

EVGA has the highest memory of them all, but if my non reference ASUS R9 290 has taught me anything, is that core clock doesn't always improve hashrate. (Need a Core of 880 to get decent kh/s)

Seems to me, the best cards for coin mining are cards with the highest possible memory overclock.
Some memory overclocking is required to hash at more than 300 khash/s.
My stock MSI (dual fan) 750 Ti can easily run +400 OC on the memory. But +500 will eventually crash in cudaminer.
My stock Asus (dual fan) 750 Ti (with modded bios) is only 24/7 stable around +200 OC on the memory. However, it can run at +400 mem in cudaminer for 5-10 min before crashing.

My suspicion is that the Asus card needs better memory cooling to reach stable +400 mem OC.
My guess is that all GTX 750 and 750 Ti cards would benefit from better memory cooling to run stable at higher memory OC.
The question is .... what are some effective ways to cool memory on these cards?
     
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post #549 of 1291
My Gigabyte OC is running stable with +135/+650.
It gives
Quote:
Originally Posted by Partol View Post

Seems to me, the best cards for coin mining are cards with the highest possible memory overclock.
Some memory overclocking is required to hash at more than 300 khash/s.
My stock MSI (dual fan) 750 Ti can easily run +400 OC on the memory. But +500 will eventually crash in cudaminer.
My stock Asus (dual fan) 750 Ti (with modded bios) is only 24/7 stable around +200 OC on the memory. However, it can run at +400 mem in cudaminer for 5-10 min before crashing.

My suspicion is that the Asus card needs better memory cooling to reach stable +400 mem OC.
My guess is that all GTX 750 and 750 Ti cards would benefit from better memory cooling to run stable at higher memory OC.
The question is .... what are some effective ways to cool memory on these cards?

My Gigabyte OC is running stable with +135/+650 on Precision X.
It gives me an average rate of 300KHs without using the -H1 on cudaminer, that uses the CPU also. With that you gain at least 10KHs.
post #550 of 1291
Quote:
Originally Posted by ivanlabrie View Post

Stick to that till that promo ends, then start mining ultracoin or yacoin. thumb.gif
Watch the cudaminer thread closely, over at bitcointalk.

Trying UTC right now...

Its normal to have a lower rate if compared with scrypt?
I was having around 59KHs with 1 GTX 750 Ti (scrypt gives me ~300KHs), but suddenly it dropped to 7KHs only.
EDIT: rebooted the PC and went back to 58~59... o.Oa

With parameters do you pass to cudaminer?
EDIT: I'm using just the "-i 1" to have less lag on the screen.
Edited by RavenXBR - 3/15/14 at 10:13pm
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