K8T Neo2-F MS-6702E Error using Dual Channel RAM slots

Question

Hello
with RAM banks on slot 1 & 3 or 2&4 as recomanded, the PC doesn't start up
on the D-Bracket 3 red leds signs memory error!
The Ram is Kingston kit 2x512 KVR400x64C3AK2/1G
Someone can help me?

Answer 1

I thought you may be interested to know of my experience with memory on this motherboard. I had 2 x 256MB of Geil Value PC3200 DDR Ram on slots 1 and 3 for months and months with no problem at all - they were identical modules but NOT a matched pair - and ran in dual channel mode @ 2.5 3 3 6 and 400MHz according to CPU-Z ... absolutely no problems at all. These are double sided memory modules.
I wanted to upgrade and bought a matched pair of 2 x 512 Geil Value PC3200 DDR RAM intending to upgrade to 1.5GB ... I thought that I should put the two 512s in the green (DIMMS 1 and 2) and the two 256s in the purple (DIMMS 3 and 4) ... all I got was 3 beeps ...3 beeps, etc ...so I put the two 512s in DIMM 1 and 3 .... no problems!!!!! ... then I emailed MSI and got a reply ..... put the two 512s in slots 1 and 3 and the two 256s in slots 2 and 4 ... works fine!! ... now I have 1.5GB memory.
One other thing - the memory now (exactly as the manual says it would!!) runs at 333 on 2 3 3 5; this is 2 clock cycles for the CAS latency (???) ... instead of 2.5 .. so although the bus speed is slower, it takes fewer clock cycles for this to happen (whatever it actually does - something to do with the Column Address Strobe - how quickly/regularly the columns in memory are strobed. ...).
I don't pretend to be an expert but 2.5 clock cycles at 400MHz is equivalent to 2.5 nanoseconds per cycle which is 6.25 nanoseconds for 2.5 clock cycles .... 2 clock cycles at 333 MHz is 3 nanoseconds per clock cycle ( at first glance slower ... but) so 2 clock cycles take 6 nanoseconds ... so this has to mean that 2 3 3 5 at 333 MHz is faster than 2.5 3 3 6 at 400 MHz doesn't it?
JLP