My SDRAM can't run at fastest timings

[hk10Mbps]

My SDRAM is PC-133 rated, but can't run at fastest timings at 133Mhz bus. I bought these ram yesterday, can I go back to the shop and exchange for faster one?

 

[Lord Evermore]

Memory that's able to run at faster timings is generally more expensive, although with PC133 becoming less common, it's now almost the same price when you buy it online. Your local shop likely doesn't carry memory rated for faster speeds since they can get better bulk pricing on the slower memory, or will gouge you on the price if they do. You probably won't see such a tremendous difference in performance that it would be worth more than a few bucks increase in price.

What you probably want is memory rated for CAS latency 2 (may appear as CL2), which is the fastest that standard SDRAM will be rated for. What you've got is probably CL3.

Compare prices at Crucial to what you can get locally, if you're in the US. It's good memory, and can be run at faster timings. And the shipping is free, and every time I've ordered, it's gotten to me in less than 20 hours. Use the motherboard selector to make sure you get memory that will be compatible, since the BX chipset doesn't support high-density memory. You can read this FAQ to get what that means.

 

[hk10Mbps]

I went back to the store today to try exchange for other faster Ram, but they say they don't have PC-150 ram and all their ram are CL2.5 or 3 only, no CL2. I don't know what I can do now with the ram that I bought yesterday.

 

[blackhawk]

You can sell it or just live with the stock settings. PC-133 only has to run at stock settings to be rated at 133.

I have quite a few sticks of micron crucial with the 7E rating which are good for cas 2 up to the 140's anyway. Nice stuff and cheap but its still rated at 133

PC 150 is rated at stock speed at 150, thus fast timings at 133 or a bit more. You'll pay a premium for it though.
I think crucial 7E is the best ram/value out there for sdram.