3x 750ti .... some confusions.... answer me please

[malekbaba]

Does 3x 750ti means 2gb*3= 6gb ram?
Due to dag file size issue, 3x 750ti will be able to mine ETH, efficiently ?

[bathrobehero]

Does 3x 750ti means 2gb*3= 6gb ram?
Due to dag file size issue, 3x 750ti will be able to mine ETH, efficiently ?

Nah, every algo that I know of is always uses memory on a per card basis. Memory bandwidth between cards is terrible (~250 MB/s for PCI-E 1.0 which is the case with the most commonly used 16x-1x risers) so it doesn't worth it to mix things up.
750 Ti does 2-3 Mh/s if you're lucky with currently available software while it would need to do 6-7 Mh/s to be comparable to higher end cards (9xx).

[BARR_Official]

750ti is in some ways the best card ever made. 

But it doesn't support SLI, and you wouldn't use SLI for mining anyway.

[bathrobehero]

750ti is in some ways the best card ever made.  

But it doesn't support SLI, and you wouldn't use SLI for mining anyway.

More like was if you ask me. It costs too much to buy a whole rig just for 6 x 750 Ti. The cost of the rig itself is heavily delaying your ROI with current mining profitability.
Any properly cooled 9xx series card have the same efficiency as 750 Ti's or very close to it.

The best cards depends on your local prices but for me 970's are the sweet spot.

[malekbaba]

I do not know why but there was a voltage issue or may be temp issue as a result my card get burnt. so here is a calculation. If i lose a 970, i will loose $350, my mining will be stoppped and also i will be unable to run my pc. But if I mine with 3x or 2x 750ti , if one shows any issue, i will loose $120. so may be it is good for small miner like me to start with some 750ti's

[Ejanend]

I do not know why but there was a voltage issue or may be temp issue as a result my card get burnt. so here is a calculation. If i lose a 970, i will loose $350, my mining will be stoppped and also i will be unable to run my pc. But if I mine with 3x or 2x 750ti , if one shows any issue, i will loose $120. so may be it is good for small miner like me to start with some 750ti's

I use high end card to put into my mining rig and put as many as possible. So the cost of the motherboard, CPU etc are lower per mining card.

[malekbaba]

Is R9 380x a good option ?

[Docnaster]

Is R9 380x a good option ?

It is OK to mine DAG. It is slower than 280X and is more expensive. But if you have the money, you can buy a new one.

[Greenenergy]

Is R9 380x a good option ?

It is OK to mine DAG. It is slower than 280X and is more expensive. But if you have the money, you can buy a new one.

That's true. Frankly, I don't see what is the point of using this card because it's a lot more expensive and you'll earn less .

[djm34]

Does 3x 750ti means 2gb*3= 6gb ram?
Due to dag file size issue, 3x 750ti will be able to mine ETH, efficiently ?

depends a bit of what algo you are running.
If you are running hard memory algo such as lyra/neoscrypt/ (ethminer, but I think we can forgot it with this card), you will require that much memory (or alternatively pagefile).

This is how cuda works:
The allocation to the GPU memory proceed through the pre-allocation of the space address memory (?? I love using jargon, I don't understand entirely ) on the RAM. So say you want to allocate 2Gb of GPU mem, you'll need 2GB of ram or equivalent (pagefile system) for the pre-allocation.

Hence you DO need the same amount of RAM. (I have been saying it like forever... )