Instruct: Classify the given review into positive or negative sentiment.
Query: Worked real well, for less than 24 hours...

As already mentioned by another reviewer, this RAM is NOT CAS 2.5, but CAS 3 (3-3-3-8 according to SPD). Running on my electronics lab computer, an Opteron 185 w/2GB Geil RAM and a Sapphire Radeon 3850 AGP, the RAM worked fine for less than 24 hours before it started causing lockups, requiring a hard reset. Since the RAM that was already in there has relaxed timings compared to this RAM (3-4-4-8), the only excuse for this failure is poor quality control at Corsair.After the failures, I ran these through a series of Memtest86+ runs, and both failed at their rated timings in less than 20 minutes.I've purchased Corsair RAM 3 times now. The first RAM is still going strong, but the last two sets were both defective. Corsair will never again see a dollar from me.