A very good read
http://www.overclock.net/faqs/26706-...s-dummies.html
The oddity of tightening the timings (or lowering the numbers) is that the overall speed of the RAM gets comprimised.
So the most important "CAS" of 2.5 will achieve higher bus speeds vs the CAS2 timings when OCing the CPU.
Check the below link and note the "memtest" segment... for testing for stability when modding the timings
Once you pass those do a full test overnight... takes a long tome for the full testing.
http://www.overclock.net/faqs/38268-...roduction.html

http://www.overclock.net/faqs/26706-...s-dummies.html
The oddity of tightening the timings (or lowering the numbers) is that the overall speed of the RAM gets comprimised.
So the most important "CAS" of 2.5 will achieve higher bus speeds vs the CAS2 timings when OCing the CPU.
Check the below link and note the "memtest" segment... for testing for stability when modding the timings

Once you pass those do a full test overnight... takes a long tome for the full testing.
http://www.overclock.net/faqs/38268-...roduction.html