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Is this why Ryzen is having problems with higher RAM frequencies?
- Thread starter trents
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latency of Zip drive, This is a little better. but voltage is not right 1.46 ?
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Just wanted to give this a bump and show that 32 GB will work with samsung single sided B die 4x8GB. This was too easy for the ram all I did was set the frequencies/timings up to 2666 then BCLK to 3200 all voltages on auto except core and SOC which is 1.1V
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nice johan45,
try it with 8, not the best sore but fun.
try it with 8, not the best sore but fun.
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Interesting, I couldn't make my kits to work above 2666 on X370-Pro Prime when I used 4 sticks. Maybe new AGESA will fix it as memory clearly can make it and mobo too but you've used 2666+bclk.
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Use 2 sticks kit, 4 will only do 2666 at best
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That's why I said it's interesting as using only memory ratio, 4 memory sticks are not working above 2666 on my board and there is no bclk option. Johan set 3200 using 4 sticks but as he said, memory ratio was at 2666 + ~120 bclk.
I don't think it's hardware limit but more like something with current CPU/chipset microcode and higher memory support will be probably added in future AGESA update.
On the other hand I was counting on higher bandwidth difference between 2 and 4 memory modules and I see almost only ~+5GB/s memory copy.
I don't think it's hardware limit but more like something with current CPU/chipset microcode and higher memory support will be probably added in future AGESA update.
On the other hand I was counting on higher bandwidth difference between 2 and 4 memory modules and I see almost only ~+5GB/s memory copy.
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I have the same asus Prime x370 pro, as you and I am hoping asus next BIOS update we get the 3600 MHZ and the base clock option.
Gigabytes
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Your memory timing will depend on what the memory is capable of. Loose or tight will depend on the memory you are using, don't listen to others.
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Base clock option will never happen, you should upgrade now.
Still nice max clock. IMC isn't scalling as good as I was expecting. Well, there is 5-7GB/s more than at 3200 but latency is without big changes and copy is about the same as at lower clock. Something is missing. Would be nice to see that stable at 4000.
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Not with ryzen the sub timmings are set by the mb and what ram divider you are using . So even if you have nice fast ram with low timmings and unless you use blclk to raise your ram you will be stuck using what ever the mb company chose for 3200/3600 or what ever speed you are trying to use .
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It still makes me wonder if it can fully support bclk or there are other issues what cause motherboard manufacturers not to add bclk option in BIOS ( besides that no one would buy some of the top X370 boards ). ASUS Prime X370-Pro has bclk option described in the manual but it's not available in official BIOS ( and there is no beta available ). Also early BIOS releases had long timing list in BIOS. I didn't check if it's working and flashing to these earlier releases may cause bricking the BIOS so I'm not going to try that ( again ).
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The base-clock (BCLK)
Overclocking the base clock (BCLK) on AM4 platform is possible, however generally not recommended. This is due to its frequency relations with other interfaces, such as the PCIe. Unlike with Intel's more recent CPUs, there is no asynchronous mode (straps / gears) available, which would allow stepping down the PCIe frequency at certain intervals. The PCIe frequency relation is fixed and therefore it increases at the same rate with the BCLK. Gen. 3 operation can generally be sustained up to ~107MHz frequency and higher speeds will usually require forcing the links to either Gen. 2 or to Gen. 1 modes.
Unstable PCIe can cause various issues, such as system crashes, data corruption (M.2 SSDs), graphical artifacts and various kinds of other undefined behavior.
Overclocking the base clock (BCLK) on AM4 platform is possible, however generally not recommended. This is due to its frequency relations with other interfaces, such as the PCIe. Unlike with Intel's more recent CPUs, there is no asynchronous mode (straps / gears) available, which would allow stepping down the PCIe frequency at certain intervals. The PCIe frequency relation is fixed and therefore it increases at the same rate with the BCLK. Gen. 3 operation can generally be sustained up to ~107MHz frequency and higher speeds will usually require forcing the links to either Gen. 2 or to Gen. 1 modes.
Unstable PCIe can cause various issues, such as system crashes, data corruption (M.2 SSDs), graphical artifacts and various kinds of other undefined behavior.
There are still things we are trying to figure out like AMD reps said that high memory clock above 3200 is the best for Ryzen perfomance but somehow there are no motherboards which are officially supporting more than 3200. So you use bclk option or there will be BIOS update with higher memory ratios.
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No idea
.@readers
Post 55 contained some screenies of subtimings. tRFC is being read back incorrectly, this case may not be limited to C6H. So if members can chime in be great to know.
Here is the bug as explained by The Stilt in the context of Asus Crosshair VI Hero.
The C6H received a beta UEFI with AGESA 1.0.0.6 and WOW. 2x R7 1700 I have both stomped 3466MHz, 3508MHz was MAX I got with mild BCLK tweak on 3466MHz strap. As I was aiming to use stock like VDIMM, I got 16-16-16-16-36-560-416-256-2T, probably could have lowered tRFC but time was against me. I may have a replay
. Currently using 3333MHz/strap with 2800MHz subtimings and 14-14-14-14-34-560-416-256-1T. Hoping to read a great review of some B-Die on a Ryzen with new AGESA by yourself . Always found your RAM reviews/threads great to ref in the past .
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I have 5 Samsung B kits at home but my current X370 board doesn't have updated BIOS. I will make some tests when I get new BIOS. Maybe I will get something new for review but hard to say what and when. I know there will be something new from RGB series ( can't say what and when ) but I have no idea what IC will be used in these kits. Right now I can't afford new memory kits which are way to expensive but if I was looking for a new kit then it would be something 2x16GB and these are in sick prices.
