[atomiks]

Just received what *should* have been 3 PC100 222 512MB sticks from OWC. Just having come off a bad experience with Coast to Coast, I was hoping for better. They had given me PC133 333 chips instead.

What initially got me worried was that the stickers on the sticks said PC133. I install them, they work OK. Apple System Profiler reports that they are PC100 222's. Great. This is good, I'm thinking. Then DIMMFirstAid reports that they are PC133 333's. I haven't noticed as much a slowdown as I did with the Coast2Coast memory, but Gauge Pro is definitely showing a slow down with the memory transfer.

Before, with the Apple supplied RAM, I could get about 230MB/s off a cold boot, and 250MB/s after/while running some apps. Now, it's 220MB/s, and 210MB/s after/while running apps.

Does anybody have any ideas? I had enough trouble sending the Coast to Coast memory back. Which one is reporting the correct values?

Thanx in advance.

[Scott Gerenser]

Don't be so quick to judge if you don't totally understand the details of SRAM. PC133 SDRAM often runs at 333 speed at 133 mhz, but when clocked down to a slower speed, such as 100 mhz, has no problem running at 222 spec.

So rest assured, you're running your RAM at 222, while the RAM is *speced* for 333 at 133mhz, which is actually faster than 222 at 100 MHz.

[Gregory]

What matters is that SDRAM on a 100 mhz front side bus needs to run at 8 nanoseconds, not 10, not 9. PC133 is designed to run at 7.5 nanoseconds. The focus on CAS2 or if it is 3-2-2 or something else is slightly less important.

Also, GaugePro is not a very accurate measure.

What Mac model? G4 I would guess, because of the 512MB sticks that can't be used in even a Yikes! or earlier model and the 230MB/s memory thruput.

Rest assurred, PC133 is fine. TechWorks is now selling only that type even for PC100 systems like the Blue & White. Easier to make one type of SDRAM which is backware compatible, and PC100 is now history I guess.