That being said. Latency performance is the most important thing to measure. Bandwidth rates are usually tied to the clock speed of the kit. I found that if you want to get the fastest possible RAM the way to go (on the ryzen platform) is to get a kit rated over 4000Mhz with a cl18 or better. I use Tforce Xtreem -TEAMGROUP-UD4-4500 and Gskill Ripjaw F4-4000C15-8GVK.
Both kits can run at 3800Mhz-cl14 for me and I am currently using 2x8GB sticks of Ripjaw and 2x8GB TeamGroup together because they work together so well. I don't know if there are any kits able to run lower than cl14 at 3800. But any top end B-die kits should do really well. Kits rated below 3800 may not be able to overclock as low.
Now the 3800Mhz limit is pretty much on point. Some ryzen cpu's are able to run the Infinity Fabric + Memory clocks higher than that, but you need to check for WHEA errors. I could set the clocks to 4200Mhz on a 5600x I have and get ultra low latency and close to max bandwidth speed and the system would appear stable. But I found whea errors would start to appear in hwinfo over and over. I haven't looked into the reason they happen, but I am guessing it's because the I-fab is at such a high setting. Past bios updates have raised the I-fab limits, and while it is possible future bios updates may be able to raise the stable speeds even higher, I think It's more likely that the 3800Mhz (give or take) limit is the best we are gonna get.
My 5600x is able to run a higher I-fab+mclk than my 5900x. And from the charts I have looked at, the 5600x chips typically run with I-fab set to speeds over 2000Mhz and some users don't notice any problems except for the thousands of whea errors. After finding the lowest stable (500% 1usmus-v3-TM5) timings at 3800Mhz and 4200Mhz. - I am planning to compare the performance difference of each after overclocking the CPU. Only because I am interested in knowing if there is any performance penalty due to the whea errors or not. The RAM benchmarks show a decent improvement in latency and bandwidth. So the plan was to find the best performing overclock at 3800Mhz since that is usually achievable without a problem. Then see if it is possible to get more performance with RAM @ 4200Mhz with the Ryzen 5600x.
I haven't gotten around to it yet because I have been testing out my 5900x in my spare time. Right now there are so many different opinions on what the best way to get the most from the new Ryzen 3 chips. I am pretty happy with the results I've gotten with beta CTR 2.1. I paid for the early access for the last couple months and It really is an awesome piece of software. I've managed to get an all time high of 44012 in the passmark CPU test (which may be higher than the highest reported score for 5900x) which I couldn't submit and a submitted score of 43,395 https://www.passmark.com/baselines/V...d=137690043799 using a corsair h150i 3 fan AIO, without using crazy voltage levels or playing with the curve optimizer. Since the passmark benchmark tests single thread and multi core performance tests and covers many different performance points (and since this is the passmark forum) I'm not gonna mention other benchmarks (but they are high).
I did have a chance to try CTR 2.1 with a 4200Mhz RAM + 2100 Infinity fabric(whea errors) but the results were inconsistent. And I am more interested in the 5900x for now since it's basically 2 5600x's. But when I do get back to the 5600 I'm gonna look into what effect the whea errors have on performance. But my guess is that the errors mean the cpu needs to correct some error repeatedly (hurting performance) and any performance gain from the higher RAM clock will be negated.
Below are some test results.
Memory latency test, Tforce 4500cl18 Gskill ripjaw 4000cl15 mixed 2x8G and 2x8GB
I expected the Tforce to hold the gskill back a little but the t-force keeps right up in the 4x8 configuration
I like to use premium B-Die kits rated much higher. Just keep in mind the XMP profile will be set too high for most ryzen cpu's
Just for convenience I purchased typhoon burner to change the xmp profile.
I couldn't post the result due to a previous 5% difference. Even after buying the full version. The ideal
method for overclocking Ryzen 3 is still up for debate.
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