RAM DIMMS - real world different??

Im looking at getting a HP EliteDesk 800 G2, off the shelf spec:
  1. 1 x Core i7 6700 / 3.4 GHz
  2. RAM 8 GB
  3. SSD 256 GB
  4. 3D V-NAND technology
  5. DVD SuperMulti
  6. HD Graphics 530
  7. GigE - Win 10 Pro
This is going to be used as my main management desktop, Not going to be doing anything fancy on it as managing VMWare network etc.

Looking at increasing the RAM (this desktop has 8 slots and can take a max of 64GB). The site Im getting it from offers these two 8MB DIMMs:
HPDimmDiff.jpgBesides the price can someone explain to me in real world terms the difference. I see its the Latency Timings - but what does that actually mean? The £210 difference could mean a good monitor!

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Mark GalvinManaging Director / Principal ConsultantAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
1) HP says, that machine has 4 DIMM slots, not 8.  Double-check.

2) Based on those specs, there is no practical, real-world difference in those memory modules.  

3) You can probably get equivalent memory for even less money.

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Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
CL (CAS Latency) is the delay time between the moment a memory controller tells the memory module to access a particular memory column on a RAM module, and the moment the data from the given array location is available on the module's output pins. It is sometimes call Column Access Strobe (CAS) Latency,

Since the HP does not have any value you cannot compare them but Lower CL = better performance.

But since you said this is going to be used as your main management desktop, Not going to be doing anything fancy on it as managing VMWare network etc, the CL should not be of that importance but if you are running an application than need better response such as game, business critical applications etc, you might want to take this into consideration.

Mark GalvinManaging Director / Principal ConsultantAuthor Commented:

Its not the tower - its this one - but still only 4 slots, so thanks for pointing that out!

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