On Thu, Dec 23, 2010 at 11:13:14AM +1000, alex au wrote: > Hi all, > > I've got 1 HDD with tables from Sascha and USB caddy with NCQ. The 3310 with > cable. However looking at what video cards would be minimum specs for laptop > to start out with as I'm buying a new laptop for this project.
With a single NCQ capable disk one can expect 150 seeks per second and you need a GPU that can create that many chains per second. To be precise you need a GPU that can compute around 66% of that 150 chains per second because only roughly 1/4 of the endpoints you lookup will be a hit for which you have to continue the computation at the start of the chain. The slowest radeon i got my hand on is a HD4350 and it can already produce 1000 chains per second with 16 * 5 32bit ALUs @ 650 mhz. So it is gonna be hard to buy a GPU that will be to slow for the job. Even desktop mainboards with a AMD890 chipset have 8 * 5 ALUs @ 500mhz. Be prepared that in order to search 1 burst in all 40 tables with that kind of hardware, you will need 40 * 8 * 51 / 150 = 100 seconds and for a 50% success rate you will need ca. 4 bursts. _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
