Difference between DDR2 667 MHz PC2 5300 and PC 5400 RAM

Check this thread out. http://discussions.apple.com/message.jspa?messageID=3352161

PC2-5400 is not an industry standard. If anything, it's for hobbyists who "overclock" their systems, or run them slightly faster than recommended by hacking into the system clock. It's likely just PC2-5300 ICs that have been tested to properly function at a slightly higher clock frequency.

Is this an OCZ module? They're big on overclocked memory.

howarduns wrote:
I saw several different typed of PC 5400 RAM advertised on tigerdirect.ca's web site
http://www.tigerdirect.ca/applications/category/compare.asp?CatId=150

http://en.wikipedia.org/wiki/DDR2

+Some manufacturers label their DDR2-667 sticks as PC2-5400 instead of PC2-5300. At least one manufacturer has reported this reflects successful testing at a faster-than standard speed.+

There also seems to be a lot of inconsistency, since some are released as PC2-5400, while others are PC-5400. I think JEDEC might have a trademark on the naming convention, so some might give it a slightly different name.

This is a comparison test (for desktop memory) that sort of explains the difference:

http://metku.net/index.html?path=reviews/ddr21/indexeng

y pw wrote:
PC2-5400 is not an industry standard. If anything, it's for hobbyists who "overclock" their systems, or run them slightly faster than recommended by hacking into the system clock. It's likely just PC2-5300 ICs that have been tested to properly function at a slightly higher clock frequency.

I saw this on OCZ's user forum, where OCZ employees directly answer questions and help troubleshoot:

http://www.ocztechnologyforum.com/forum/showthread.php?t=24480

5300, 5400....same thing really....the actual speed comes out somewhere between 53 and 5400 MB/s so it just depends on the manufacturer how they rate it.

They should work fine.