So for 99% or more of the people out there, the slot orientation just really doesn't matter honestly. It really won't matter if you're running LPX 3000 sticks cause you'll probably never see past 4000 if your lucky to get that far. Most other boards can just about accomplish the same thing having 4 slots, just populate 2 and off you go.īut more to memory overclocking than just simply slot orientation. It's simply not designed this way.īoards that lean towards memory performance will be fitted with only 2 slots, when occupying 4 slots, this typically reduces performance running a lower frequency to accommodate the increased capacity.Īt this point, Asus Apex would be ideal, has 2 slots and completely geared towards memory OC. So no, just because the first slot is closest doesn't mean it's fastest. MAY NOT work for you as you have 2 different sizes of Memory though.Īnyway, do the SINGLE DIMM test and it both boot individually, check the link above and populate like the link had the DIMMs populated.Title says it all, 1 and 3 are physically closer yet 2 and 4 are faster, why?īecause of bios and electrical design, memory compatibility should simply follow the manuals instructions. the ORDER and placement of the DIMM's fixed it. However, I just searched HERE and found this Subject, and it is a VERY SIMILAR problem, and it was SOLVED. You can call Customer Support or email them. In any event, you might want to try Crucial's website if none will boot. No I have 2 16GB sticks from Crucial that I bought on the SAME page at Amazon, so I'd not think there would be a difference between the 16GB and 32GB DIMM's in specifications other than size of the DIMM?īy doing the single 32GB DIMM test it should rule out if there was a failure on one of them? Possible, say, the speed of one on the BIOS check wasn't fast enough, and on the other computer it isn't checked? Who knows?

I would NOT think they'd put a test into BIOS to stop booting though? The keyword is SUPPORTED, that usually only means if you have a different one, Dell will not assist. Note that 80GB's of memory is not a supported configuration. Now, that said, might have a point about a BIOS change? Why? Well, from the 8940 Setup Manual there is this chart: It is possible one would not boot and it has failed (Crucial will replace it). Using ONLY Slot 5, the closest to the CPU, put in one 32GB DIMM and see if you can boot. Just make sure Slots 1 and 3 match, and Slots 2 and 4 match capacities and all slots should ideally have the same speed, latency and timings. So 8GB - 16GB - 8GB - 16GB would be fine, since Channel A (8GB + 16GB) equals Channel B (8GB + 16GB). Well, first I think you need to do one additional test. With 4 slots, most systems have two slots per channel.

For the additional info (you English is fine!).

3 ram sticks 4 slots