RAM-Question

[SR-F_Winger]

Wich is the better Choice and would it make a Diffrence using VR (Index).

 

DDR4 4000 CL19 (16 GB)

or rather

DDR4 3200 CL14 (32GB)

on a I9 9900K @ 5GHz on Gigaby Z390 Aorus Master MoBo

Edited December 11, 2019 by Winger

[dburne]

You can have a look at some the results from benchmarking in this thread:

 

However I think the answer to your question is still not realized.

I personally think either way you will be pleased, if there is a difference I doubt it would be much as the higher speed of the ram also has a higher latency.

[SR-F_Winger]

thanks!

[chiliwili69]

The size 16Gb versus 32Gb doesn´t matter for IL-2 or IL-2 VR, since IL-2 only consume about 7-8Gb

 

Then let´s take a look of frequencies and latencies. The important thing is the true latency which is equal 2000*CAS/Freq given in nanoseconds.

 

So:

4000MHz with CL19 gives 9.5 ns

3200MHz with CL14 gives 8.75 ns

so theoretically is better 3200MHz with CL14

 

But If I were you and your Mobo support it I would pick

 

4400MHz with CL17 giving 7.73 ns.

That RAM is used by @WallterScott  who has reached the current top mark in the benchmark (with High clouds).

 

Also remember to get the RAM always in pairs to used dual channel. Either 2x8Gb or 4x4Gb.

Edited December 12, 2019 by chiliwili69

[SeaW0lf]

3 hours ago, chiliwili69 said:

The size 16Gb versus 32Gb doesn´t matter for IL-2 or IL-2 VR, since IL-2 only consume about 7-8Gb

 

Then let´s take a look of frequencies and latencies. The important thing is the true latency which is equal 2000*CAS/Freq given in nanoseconds.

 

So:

4000MHz with CL19 gives 9.5 ns

3200MHz with CL14 gives 8.75 ns

so theoretically is better 3200MHz with CL14

 

But If I were you and your Mobo support it I would pick

 

4400MHz with CL17 giving 7.73 ns.

That RAM is used by @WallterScott  who has reached the current top mark in the benchmark (with High clouds).

 

Also remember to get the RAM always in pairs to used dual channel. Either 2x8Gb or 4x4Gb.

 

I read somewhere that this math is not that relevant, that most processing is done by the clock, not the cas frequency, then it is better to have a higher clock than cas if the difference is not that blatant.

 

https://www.crucial.com/usa/en/memory-performance-speed-latency  Which is more important: speed or latency? Based on in-depth engineering analysis and extensive testing in the Crucial Performance Lab, the answer to this classic question is speed. In general, as speeds have increased, true latencies have remained approximately the same, meaning faster speeds enable you to achieve a higher level of performance. True latencies haven't necessarily increased, just CAS latencies. And CL ratings are an inaccurate, and often misleading, indicator of true latency (and memory) performance.

 

I think the sweet spot in this case could be 3600Mhz RAM with 14 cas.

[chiliwili69]

They say to go speed over CAS, but they say that the important thing is the true latency (calculated in a column in the Remagen benchmark table). So, for a given budget and size (16GB) we should go to minimize the true latency.

 

Here we have 3800MHz with CAS 14, so 7.36ns but no stock!:

https://pcpartpicker.com/product/43wkcf/gskill-trident-z-neo-32-gb-4-x-8-gb-ddr4-3800-memory-f4-3800c14q-32gtzn

 

Or 4266MHz with CAS 16, so 7.5ns:

https://pcpartpicker.com/product/VmgQzy/corsair-vengeance-lpx-16-gb-2-x-8-gb-ddr4-4266-memory-cmk16gx4m2k4266c16

 

or 4800MHz with CAS 18, so 7.5ns (but quite expensive)

https://pcpartpicker.com/product/zrZFf7/gskill-trident-z-royal-16-gb-2-x-8-gb-ddr4-4800-memory-f4-4800c18d-16gtrs

 

In that PCpartpicker web you can filter by CAS and then order the results by frequency.

 

You should also check that your Mobo support that frequencies.

 

Edited December 12, 2019 by chiliwili69

[Alonzo]

There's also a big difference between something generic that Crucial is writing about memory in general, and the testing we've done for VR setups for IL2. Unquestionably, IL2 likes low-latency RAM. In the case of the very exotic 4400mhz CAS 17 RAM that one pilot tested, they got pretty amazing results.

[SeaW0lf]

56 minutes ago, Alonzo said:

There's also a big difference between something generic that Crucial is writing about memory in general, and the testing we've done for VR setups for IL2. Unquestionably, IL2 likes low-latency RAM. In the case of the very exotic 4400mhz CAS 17 RAM that one pilot tested, they got pretty amazing results.

 

4400Mhz with cas 17 is the best of both worlds and cannot be considered just low cas. It has a very good speed as well. The same with 3600Mhz and cas 14. Great speed / cas ratio.