Which cpu to keep?

[demiurge3141]

Have two e2140 here both VID 1.325, one is 400x8 stable at 1.384 (load), however seem to have fsb wall around 415 (even throwing 1.55 at it cannot get stability) The other needs 1.416 (load) to hit 400x8, but seem to have fsb wall around 430, in fact it did about 12 hours prime 415x8 with 1.504 (but it did fail at the end). I am thinking about upgrading to water soon and would like to take the cpu to the max for a 24/7 folding machine. Which one is better to keep? I heard that the fsb wall is different for water cooling, is that true?