We find that the CAS 3 rating is kind of weird. On both platforms we tested, it seems that whenever we set to CAS 3, the system won't boot. It happened on both boards. We thought it was the ram timings but it doesn't seem so. As we tune it to CAS 2.5, with the same low ram timings, it POSTs and works. It remains a mystery to us. Another thing that we noted is that if RAM is set to run in SPD mode, it will be recognised it as a DDR333 stick. This will lower the performance of the system if you are running a 400MHz Barton or a 800Mhz CPU.
Considering that it is a PC3700 CAS 3 module, we are not able to reach the DDR466 (233) levels using relaxed timings. The best effort was done on the IC7-G reaching 223MHz steadily using CPU:MEM at 1:1 and Ram timings at CAS 2.5-7-4-4.
Overall, the two modules works flawlessly at 200MHz~210MHz FSB at aggressive timings on AMD and works well under P4 at 223MHz. Although it is a 10MHz gap from the 233MHz (PC3700), it's stability rounds it all as a good choice for DDR400 systems if you were to run it at CAS 2.5 or even at CAS 2. Price at USD66 per piece, it is definitely worth considering.
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