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Denis Zavelev
denis.zavelev@gmail.com

Thanks for the reply.
Yes, it seems that for my case SSDs will be enough (retailer promised me 3-year warranty). I started 2 similar tasks (DFT computation of Ti-Cu oxide system) on 2 workstations:
1. Core2Quad Q6600 @ 2.40GHz / 4Gb DDR2-6400 / 4x320Gb SATA HDD / reiserfs / Ubuntu 8.10 amd64
2. Phenom II X4 965 BE @ 3.40GHz / 8 GB DDR3-12800 / SATA II HDD (system) + 2x128Gb SATA II SSD / ext4 (without journaling) / Ubuntu 9.10 amd64
and compared cpu utilization. In first case it's about 70%, in 2nd case it's about 99.5%.
Thus for my typical tasks 1 SATA II SSD per 2 cores (physical or logical if I get Core i7 someday) is enough. So we need just to test how long will these SSDs work.