Posted by tpc at June 18th, 2009

I got myself a hp tx2 tablet running on amd Turion with 4GB ram. A dear friend helped me upgraded to vista 64 bit in order to fully utilize the ram. I tested it against the desktop running xp 32 bit on pentium core 2 duo. I was told that this desktop actually has 8GB ram but xp 32 bit only recognise 3 GB.

It was not a rigourous test by any means but I got both systems to try and factor
2^{2^9}-1 =
(3)(5)(17)(257)(641)
(93461639715357977769163558199606896584051237541638188580280321)
(5704689200685129054721)(59649589127497217)(1238926361552897)
(67280421310721)(6700417)(65537)(274177)

Anyone want to verify the computation?

It took 2141 seconds on the notebook which, according to the software, utilized 2.3 GB but 2300 seconds on the desktop which utilized 2GB. So it’s probably the memory that made all the 10% difference.