Quote from: phk on April 28, 2013, 12:46:03 AM

Quote from: turtle83 on April 27, 2013, 04:19:05 PM

Isint GPU memory external RAM? Or is that a whole different ballgame cause of high clock frequency?

GPU have L1/L2 cache hierarchy just like a CPU. SCRYPT only performs well if it is small enough to fit into on-chip memory. If you have to go off-chip, it's going to be a turd. But yes, most graphic cards have seemingly endless amounts of external memory.

The SCRYPT configuration used in Litecoin needs 128KB, which fits easily into onchip cache in a CPU/GPU, and into onchip block memory on many (not all) FPGA.

I dont think so... I use cgminer on my 7950 with :-

Code:

--thread-concurrency 25768

Meaning its using 25768 * 128 KB of memory (roughly 3.14 GB) . On increasing the concurrency, cgminer fails on startup saying im trying to allocate more memory than available.

That or ive misunderstood the purpose off thread-concurrency