According to this my T500 can support PC3-8500 DDR3-1066 SODIMM. However, the availablity of 1066 DDR3 where I live is virtually non existent, whereas I can easily purchase a 1333 DDR3. Will it simply work at the lower frequency, or can I expect problems?
Crucial's and Kingston's memory finders show both 1066 and 1333 RAM as compatible with the T500. You are advised to stick with a reputable supplier. Avoid value RAM.
This is a resource provided by one of the contributors to this article, who said he ran Crucial (1066) in his T400.