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The T7910 can supposedly support up to DDR4-2400 memory.  Your CPU supports DDR4-1600 memory.  2637 specs.  You can put 1600 or better in the machine but with those CPUs you'll only get the 1600 spec.  Putting better memory in would be a good idea if you were planning on upgrading CPUs, for example.  If not, get the 1600 type.

Another thing would be finding out which motherboard revision he has, to see if he can upgrade to a better v3, or to a v4 instead.

Most high-clocked modules have SPD records for lower clock JDEC modes.

When you take the highest clocked modules, that means, it has the best design and lithography process used. So it will be most protected from overheat, wear, electronic noise  and other physical problems.

Except that many retail companies white incorrect data in SPD profiles; lower the speed - worse the control over what is written.

Fortunately, Micron/Crucial is a very responsible manufacturer. So I would take the highest clocked module.

Considering the 2/4 rank config, that is a hard topic.In short, less ranks allow for lower latency, more ranks allow for faster burst rates for giant data i/o. But some i5-i7 systems are limited on the total number of ranks per channel or on the max. rank size. It should not be a problem with E5 Xeon v3 series.

@gakerby 

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Crucial precision T7910 RAM

Thanks for your comments and suggestions. I very much appreciate them.

This is complicated! I’m glad I asked.

First, more information (as requested by 3Zinc my motherboard is a Dell 0215PR with a Intel C612 (Wellsburg-G) chipset and a super-IO/LPC chip SMSC FDC37C93xFR.

Intel gives the following specifications for memory for my CPU:

• Max Memory Size (dependent on memory type) - 768 GB
• Memory Types - DDR4 1600/1866/2133
• Max # of Memory Channels - 4
• Max Memory Bandwidth - 68 GB/s
• Physical Address Extensions - 46-bit
• ECC Memory Supported –Yes

Second, looks like I might need to start by upgrading my CPU (suggested by 3 Argentum). So:

1. My T7910 specifications list two (2) Intel(R) Xeon(R) CPU E5-2637 v3 3.50GHz More information here
2. SpeedStep – When I look at my configuration and the original Dell order, two (2) CPUs are always listed. (SpeedStep wrote: Slots: 16 x 32 = 512.  However this requires 2 CPU's so if you only have 1 cpu then 256 is max. I think SpeedStep misunderstood or misread my CPU configuration statement.  So with two (2) CPUs my maximum memory is 512 GB. Yes? No?)

What would anyone suggest for a CPU upgrade to match my motherboard (do I need/should I to upgrade my motherboard as 3Zinc seems to suggest?) and 512 GB of memory?)

In this regard, Newegg has a T7910 with two (2) Intel Xeon E5-2697 v3 2.6GHz 14 Core Processors and 1TB DDR4 2133MHz Registered ECC Memory. It sells for eleven thousand. Amazon has ‘renewed’ Intel Xeon E5-2697 v2 Twelve-Core Processor 2.7GHz 8.0GT/s 30MB LGA 2011 CPU BX80635E52697V2 for 129. New they are almost 1,200. Any thoughts? Is the E5-2697 compatible with my current motherboard? Is it a good CPU? Are there better?

Finally, as noted, upgrading my memory to 512 GB would not be cheap, the cost being about seventeen fifty. Then if you throw in a CPU upgrade (and maybe a new motherboard) . . .

I wonder . . .

1. Is it worth upgrading a 2016 T7910?
2. Is it still a top of the line machine?
3. How long before it becomes obsolete?
4. Can I get a better PC for the same money as a T7910 memory/CPU upgrade?

Again, my thanks for any comments, advise and suggestions you might have.

If the cost is 17050 to do the upgrades..

If we stay with Dell, and you buy and configure a new system with the specs you need

Thanks for the information.

This is way more than I want to spend. I was just looking to take my current T7910 a notch or two higher. As I said in my first post, my PC is struggling with a Word document with many internal links.

When I bought my T7910 in 2016 I was hoping there would be a big drop in CPU and memory prices five years on. This does not seem to be the case. 

NewEgg has a used business T7190 with the same basic configuration as mine (2x Intel Xeon E5-2637v3 Quad Core 3.5Ghz Processors 8 Cores, 16 Virtual Cores and 64GB DDR4-2133 Memory. while supporting up to 1024GB of total memory) for only 1400. I paid 3400 for mine. 

Newegg also has a 2x E5-2690 v3 2.6GHz 24-Cores 256GB DDR4 T7910 for only 1550. However, I wonder how long these ex-business models will last. I use my T7910 every day. 

If I sold my base T7910 I might a thousand for it which would give me 3500 or so to spend on a new/used machine. 

I'm not sure what to do now. As I said when I first bought my T7910, I thought component prices would have dropped much more than they have. Or are they temporarily high because of Covid-19 induced shortages?

Any suggestinos of where I might go (upgrade my machine/sell it and buy a new/used one) would be much apprecied.

I welcome all suggestions and comments.as to what components

1. for what components I should upgrade my T7910 with
2. what used/new machine I might consider.

Thanks.

I look forward to hearing from you

My bad, I read your 17 50 , add a zero in the middle, and started thinking based on that.

Ok, lets address a few points :

The price of ddr4 ram is high since the beginning and has never had a downward curve : covid is not related.

The same trend happened with ddr3... prices changed a bit due to the speeds, but the real game changer to have lower prices got introduced by the shift of the newer computers to ddr4. I would expect that the prices of NEW ddr4 modules will get cheaper but only after the next generation of ram is adopted by the market. (take this with a grain of salt, this is just my personal view)

For the cpus , the thing is different. But the distinction here is between a good used ( reputable seller that gives warranty / swap of part ) and a retail by now old stock that "shops" will always try to sell as high as possible. Plus yes, Intel didn't need to really innovate until very recently, when amd started to do runs around them with their cpus... 

May I ask how big is this word document, and what is the Task Manager memory usage before opening it, and after opening it ? ( also, maybe word is not the best option for this kind of documents, and something alternative would solve your issue without doing changes to the hardware ).

This said, with 3500 you can assemble an amd Threadripper pro 3955wx ( 16c/32t, mb, 3.9Ghz base ) , 256gb of ram ( 32x2 , 4 kits ), 1300W psu and a decent case.

Used... it's really up to what shows up / where / patience

NEMIX RAM 64GB 2x32GB DDR4-2933 PC4-23400 2Rx4 ECC RDIMM

$277  X  8 = $2216

The Dell Precision T7910 is a 4U workstation with support for up to: • Two Intel Xeon E5-2600 v3 or E5-2600 V4 processors

$3500 each CPU so $7000 for 2X

Xeon E5-2680 v4    2.4GHz apd 338-bjev