[blue68f100]

I think I still have hub, but mine is a 10/100 kind. 10 base that has to be old, did it support full duplex? Well 833k is good for a 10baseT.

It's my understanding that the snaps with 128m and greater will use 1/2 (64) meg reserving the other 1/2 for JVM. The Snap OS was design to work in a small amount of ram 64meg.

Snap tech says it make NO difference. I think it probably has more impact if you are use JVM than anything else. The only way to know is play with the cache settings and run test. In the olded days when HD only had 256k of disk cache, it probably had a big impact. But with most have 8+meg probably not. Originally owers reported that it made things faster, but I don't think they ran any test to confirm.

Your 4000 is a version -003 or greater?
The reason I ask is that there is a HW bug in 001 and 002 models.
If you have a 1 or 2 version, a failed drive 1 or 2 will bring down your whole raid. All kinds of odd things happen. But I under stand you have tested your system which is good.