Memory mixed config for a Precision T5500

I just got a T5500 with 6 GB of RAM recommended in it as three 2 GB in memory slots DIMM1/DIMM2/DIMM3 RDIMMs. The RDIMMS is double rank RAM Samsung M393B5673EH1-CH9 =.

I think to buy three double 4 GB row RDIMMs of the Samsung same '1 GB E-die/72-bit ECC/78FBGA' "production group" and put in DIMM1/DIMM2/DIMM3 and join the current RDIMMs DIMM4/DIMM5/DIMM_6. The 4 GB RDIMMs would be M393B5170EH1-CH9.

I don't know if the production group is the right terminology.

I realize that I might well be able to add many other types of RAM recommended for this machine.

Samsung to these RDIMMs documentation (more info that I need way) is at the ADDRESS below.

www.Samsung.com/.../180107ds_ddr3_1gb_e-die_based_rdimm_rev106.pdf

My current CPU is a Xeon E5504. I will likey updated the BIOS and then upgrade to an E5640 or faster processor and also the swap in a U016F/0U016F heatsink. I doubt I'll need 2 CPUs in this machine.

So, my question is... will this fly?

The "supported Memory Configurations" in the Installation Guide for a single processor for the T5500 are:

GB ranks DIMM1, DIMM2, DIMM3, DIMM4, DIMM5 DIMM_6
3, SR, 1 GB, 1 GB 1 GB
4, SR, 1 GB, 1 GB 1 GB, 1 GB
4, M., 2 GB, 1 GB 1 GB
8, M., 2 GB, 2 GB, 2 GB, 1 GB 1 GB
12, SR, 2 GB, 2 GB, 2 GB, 2 GB 2 GB, 2 GB
12, DR., 4 GB 4 GB 4 GB
24, DR., 4 GB 4 GB 4 GB 4 GB 4 GB, 4 GB
24, DR., 8 GB, 8 GB 8 GB
32, M., 8 GB, 8 GB 4 GB 4 GB 4 GB, 4 GB
48, DR., 8 GB, 8 GB, 8 GB, 8 GB, 8 GB, 8 GB

The configuration of the memory I want to run is not in the supported list. [The commas in the list are to avoid any compression of empty tank, if this site is.]

The installation guide says (in a configuration CPU 1) "If configuration contains DIMMs of mixed sizes, fill the DIMMS over first." Which means that my 4 GB RDIMMS should be in DIMM1/DIMM2/DIMM3.

Everyone here an experience to try a config memory like that in a T5500? Any other comments would be welcome.

Thanks for reading all this!

I ran two tests and the results are...

This memory mixed configuration worked well for me in two different T5500s. YMMV of course because it is not a "supported Memory Configurations." This means that, at the time of publication, cycle of these machines that Dell did not test for this config work in all situations and so compatibility can be a somewhat random thing in some situations.

Tests show below that for my 2 T5500s this config memory ran without error and at the same speed memory whereby each T5500 will run normally. None of these two T5500s run RAM at 1333 MHz maximum rate, because that will not support the processors they have in them. A single processor supports 1066 MHz RAM and the other RAM 800 MHz. If this test would have been done with a Xeon X 5550 or better (support 1333 MHz) then maybe a slight slowing in speed of RAM might have emerged... who knows.

The tests below were made with the Samsung M393B5673EH1-CH9 2 GB DIMM (PC3-10600R/DDR3-1333), I mentioned in the 1st post. For the DIMMs to 4 GB, I used low voltage Samsung M393B5170FH0-YH9 DIMM (PC3L-10600R/DDR3-1333) because that's what I have on the spot. I never knew before that you can mix normal and low-voltage DIMM, but I found a post about it on this forum. With the T5500/T7500, you can mix (YMMV) as long as you keep them in different banks/groups.

Banks of memory triple channel/groups are a T5500 (one per line):
DIMM1/DIMM2/DIMM3
DIMM4, DIMM5/DIMM6
the DIMM card 3 riser (if you have a 2nd CPU)

The two tests below are with 4 GB DIMM in DIMM1/DIMM2/DIMM3 and 2 GB DIMMS in DIMM4, DIMM5/DIMM_6 and not riser card/2nd of processor installed. All DIMMs are double row (2Rx4/2Rx8). For me, it was suggested by someone I respect that mix DIMMS with different grades is generally not a hot idea (YMMV). In a T5500 if you have mixed DIMM size then put DIMMs larger on riser if you on the other put them in DIMM1/DIMM2/DIMM3. In each memory/bank group, you want to have the same kind of RAM. Fact all in threes is optimal and strongly suggested.

The first machine I've tried was a T5500 2011 (mobo 0CRH6C) with a Xeon E5504 CPU. It seems that all processors E5506 or less only supports memory at 800 MHz and the E5504 is in this bucket. This means that a MEMORY faster barrette would "clock down" at 800 MHz. I did a test of 24 h on Memtest86 + v5 of the mixed config 4 GB / 2 GB DIMM without any error. The BIOS set the RAM at 800 MHz = PC3-6400/DDR3-800 speeds. It is somewhat a waste of speed, but the problem isn't with the CPU, the RAM.

The second computer I tried was a T5500 2009 (0CRH6C mobo) and the CPU was a Xeon E5640. It seems that E5550 CPU or higher support 1333 MHz memory and processors E5520 or higher support 1066 MHz memory. It seems that the E5640 is into the 2nd bucket (1066 MHz support).

I did a test of 12 hr Memtest86 + v5 of the mixed config 4 GB / 2 GB DIMM without any error. The BIOS has set 1 066 = PC3-8500/DDR3-1066 MHz RAM. Again, the slowdown has been because of the CPU.

The stickers on the 2 mobos time say 0CRH6C, but the numbers after that are a little different, so there may be a slight variation here. The T5500 2009 has the latest version of the BIOS and the 2011 has still an early BIOS (A06?).

The performance of memory at a slightly slower speed... I think that if you are using a computer that had the memory was idle a little you would have a hard time 'feel the difference' due to the fact that location main memory you want at some point is probably already in the L1/L2/L3 on the CPU cache.

Benchmarks can certainly show little difference because of the slowdown in speed of RAM, but if you are clicking on a computer and it is 5% faster or slow it's will all feel the same.

All comments/comments are quite welcome, especially on what memory speeds supported are for the processors that the T5500 can take (also T7500).

I notice that in the very recent thread started by the user claytonb entitled "Memory Configuration in Precision T5500" he has a very similar memory configuration and it works for him.

It seems that I can't join this post if a screw link follows.

http://en.community.Dell.com/
support-forums/Office
/ f/3514/t/19632835

Tags: Dell Desktop

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