5970 4 gig Whats the k has for LTC

[YipYip]

A guy has a 5970 4 gig

Does anybody know the khas for LTC for this unit ?

[r3demon]

My overclocked Radeon HD5970 2Gb version has around 400 Khash/s on scrypt for each GPU, so its 800 Khash/s for the card. I don't think the 4Gb version is any different, except maybe better for overclocking, so I would expect anything in the range of 700-900 Khash/s.

[QiVX]

If I remember, it doesn't really matter on the memory size, but rather the SPEED your memory is running at.

Go for it if it's a deal, but don't pay a great amount more because it is 4GB.

I personally only have 3 5970s with 2GB so I can't quote anything.

If you are generating for pure profit, right now at the time of this post  BTC still generates more $$

[Aseras]

You need fast memory and a fast cpu, there's a magic ratio. You can get ~800Khash. FWIW most of my 5970 puke running LTC mining.

[shmadz]

I'm running my old 5830 on a throw-away pentium 4 system that someone gave me, it couldn't do more than 10 kh/s....

then I bought some ram, (it had only 1 gig ram originally) and now it's getting 240 kh/s ---

system specs matter in litecoin, I would recommend having at least double the system ram compared to the card ram... (haven't tested yet, will try this weekend with 2 instead of 4 gigs ram and see if it affects hashrate)

I've never tried a multi-card system on litecoin so I have no idea how this affects things...

[vdragon]

It depends on thread concurencies you put in reaper. Larger the number, more memory it requires. 2x 7970 need 4gb system ram to run correctly. Also the memory on cards had to at least at the same clock as gpu

[Bogart]

I finally got litecoin mining working well on my linux miner with 3 5830s.

I get 266KH/s on each card now with zero HW errors and about 7% rejects.  My cgminer script looks like this:

#!/bin/sh

export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100

~/bin/cgminer/cgminer -o ltc.kattare.com:9332 -u xxx -p x --scrypt -I 20 --thread-concurrency 5600 -g 1 -w 128

GPUs are clocked at 800MHz with 1000MHz memory.  I tried a bunch of different memory clock speeds, but this seems to do the best with an 800MHz core speed.  I could probably get more speed if I OC'd the cores.