Because many system do run XP well enough but do not provide SSE2 support. Example: my wife's ultraportable has a 866 Pentium3 cpu with 384MB and 30GB disk. Sure a bit more ram and newer disk would do magic, it still runs quite comfortably about any "normal" software + a couple of "not that old" games. But it does not supports SSE2 and so would be VERY slow witth Lightroom.
But I didn't know Lightroom was that much optimized for SSE2 and it really explains why my desktop PC was soooo slow running Lightroom: AMD AthlonXP 2GHz with 768MBram and 200GB disk. Still OK PC isn't it? Not for Lightroom. AthlonXP only provide support for SSE and not SSE2 nor SSE3/4. To stay simple and know what CPU will provide SSE2: * Intel: Any Pentium4 or derivates (including Celeron, Xeon based on P4) and Pentium-M and derivates (Core Duo etc). * AMD: Opteron, Athlon64 and Sempron (only Sempron based on Athlon64, some were based on AthlonXP) And BTW GHz doesn't mean anything anymore. A 2GHZ AMD AthlonXP will usually eat for lunch a Pentium4 2GHz (except e.g. in Lightroom 'cos SSE2) but this 2GHz AMD will gets kicked by CoreDuo 2GHz. So, when talking about CPU, please tell your CPU model as well ;) -- Thibault Massart aka Thibouille ---------------------- *ist-D,Z1,SuperA,KX,MX, P30t and KR-10x ;) ... -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
