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FRONTPAGE AMD Ryzen 9 7900X and 7700X Review: The Dawn of ZEN 4

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Voodoo Rufus

Powder Junkie Moderator
Joined
Sep 20, 2001
Location
Bakersfield, CA
Sounds like the board makers are prepping for a stronger IMC and better ram soon for Z790?

Maybe AMD will get the speeds up with a chip spin. Or maybe we can get DDR5 with tighter timings to compensate?
 

Woomack

Benching Team Leader
Joined
Jan 2, 2005
RAM based on Hynix M could already make ~7400, but the new kits that are using Hynix A will be a bit better and the top bins should reach ~8000. Hynix M can make 8000 too, but at higher voltages which means more heat, and this is a problem in DDR5. 1.4V is still fine 24/7. More depends on the case airflow. So in comparison, memory kits available right now have up to 6600 CL32 1.40V. Memory kits expected to appear in the upcoming months should have 7200 CL34 1.40V. Well, you can set Hynix M at 7200-7400 1.40V too, but at more relaxed timings like CL38.

Even the best 2-slot Z690 motherboards are limited to about 6800. If you have luck, then you get a mobo that can go up to 8000+, but it is quite random, and you can get ASUS Apex which will make 6600 on one slot and 7600 on another one. Z790 is generally rated at 7200+, even in these lower 4-slot series, so they clearly improved something, as I highly doubt it's only IMC. All my 12600k/12900k could make 7400 on one slot, but I didn't have the luck with motherboards, and the best one could make 7000 on 2 slots. Gigabyte Z790 Master, which is a 4-slot motherboard, has 8000+ in the specs.

AMD is releasing everything slower, and I doubt we will see a higher RAM clock anytime soon unless they do something with a 1:2 ratio and higher RAM clocks. I haven't seen anyone who could run RAM at 1:2 6600+ on AMD, and I have no idea what would be the performance hit in this case. On X570/B550 4600+ 1:2 was already giving good results. X670E motherboards have RAM ratios up to 10k.

Tighter timings won't really happen. Manufacturers won't/can't release anything with very tight sub-timings and main-timings are close to the IC limits at reasonable voltages. I mean, we already have 6400-6600 CL32-39-39 kits in stores. 6400 30-38-38 is about max at 1.40-1.45V. 6400 CL28-37-37 is about max at 1.50-1.55V, which may cause overheating without additional airflow. RAM affects the performance even less than in the last gen, so there is no point in pushing it to the limits. You will see the difference between 4800/5200 and 6600+, but not really between anything 6000 and above.
 

Woomack

Benching Team Leader
Joined
Jan 2, 2005

Shamino added new BIOS for higher ASUS mobos. It is supposed to fix some issues (even though I haven't seen them on my Gene) and add per core OC for what I was waiting for.

There is also a link to OC tools - MemTweakIt and a list of tips and suggestions about manual settings. It can be handy for non-ASUS mobos too.
 

Woomack

Benching Team Leader
Joined
Jan 2, 2005
I'm not sure if I missed it on the ASUS motherboard or it simply doesn't have these options, but on Gigabyte B650E Master, in BIOS there is "high bandwidth support" (RAM) and "low latency support" (RAM). Only these 2 settings are giving me the same results using 6400 CL40-42-42 on Gigabyte, as 6400 CL30-38-38 on ASUS - about 84GB/s read, 90GB/s write, 78GB/s copy and 62ns latency in AIDA64. I mean, all I do is enable XMP, set 6400 manually, and enable these mentioned options ... vs full timing table and higher voltages on ASUS.
I already switched to Gigabyte for tests, but I will try to check it some other day.

Btw. 6600 RAM doesn't work on Gigabyte B650E Master, even though my kit is on the QVL. I know that 6600 is supposed to work on "cherry-picked" samples, but I thought it will at least boot. The motherboard just freezes with the C5 error code and I have to clear CMOS.

There is still 0802 BIOS for ASUS mobos that I had no time to check. It is supposed to help with a higher boost clock and has options to manually adjust the frequency for each core.
 
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Woomack

Benching Team Leader
Joined
Jan 2, 2005
There is a new BIOS for ASUS motherboards (7 models) - 0803:

Adds some more memory timings and changes the naming of some timings to match Ryzen Master.
I had no time to check the last BIOS, and I bet there will be another one before I find the time.

Btw. I got in my hands one of the new memory kits with EXPO and XMP profiles. At least Gigabyte B650E Master shows they're exactly the same. Gigabyte generally has a bit lower latency than ASUS looking at AIDA64 results. Since I mentioned AIDA64, then yesterday was released a new version that supports AM5, so it reads frequencies, ratios and other things. I haven't noticed any differences in test results.
 

DaveB

Senior Member
Joined
Dec 18, 2000
Microcenter Zen 4 deals:

AMD Ryzen 7 7700X - $400 plus Free 32GB DDR5-5600 RAM and $50 Motherboard Bundle Savings

AMD Ryzen 7 7900X - $550 plus Free 32GB DDR5-5600 RAM and $50 Motherboard Bundle Savings

AMD Ryzen 7 7950X - $700 plus Free 32GB DDR5-5600 RAM and $50 Motherboard Bundle Savings