20120508, 01:48  #1 
Aug 2010
Kansas
547 Posts 
GPU questions
Howdy!
So, I have a GTX 460 that is currently running mfaktc 0.18 (2 instances), which is being fed by a 3.2Ghz singlecore Pent D 940 w/ 2G DDR2 RAM. My first question is: for GPU72 exponents (currently 56M 7172 bits), will there be a noticeable difference between 420 and 4620 classes? My second question is: for GPU72 exponents (and similarly larger exponents), would P1 be feasible to implement on a GPU, even if only on a partial scale. I guess I'll break this down into two parts: for B1/B2 at the normal bounds (or a new multiplier based on GPU performance), or for B1=B2 (ie no stage 2). My third question (sorry, they just keep coming :P ) is whether, if (2) is feasible, is anyone currently trying/successfully implementing this? Thanks! Johann 
20120508, 02:48  #2  
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3·29·83 Posts 
Quote:
2) I'm not entirely sure, but it would require similar FFT multiplicationofnumbers to the LL test, just the actual calculations are a bit different. 3) Again, not sure, but I don't think anybody's working on it. LaurV had a small experiment, but I don't think he's gotten anywhere with that. 

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