Help with Ram for AMD Ryzen 7 7800X3D/ASUS ROG Strix B650E-I

[Saint Anger]

I'm finally upgrading my old Intel Core i7-7700K PC and I could use some help with the Ram.

DDR5-6000MHz CL 30 has been thrown around as a sweet spot in a couple of places.

Anyone have this and have tested?

[Rumpelcrutchskin]

Yes, 6000 MHz CL 30 is the way to go for AMD 7000 series.

[Iron Knights]

By all means if DDR6-6000mhz is cheap and on sale buy it.
But if your CPU only likes 5600mhz, you can set the XMP to that instead, you won't miss any performance. What's more crucial nowadays (~DDR4 and up) is that CAS/CL timing of 30.
Hard to find and not so cheap. That may improve your performance more than MT/S.
Perfomance is 10% of the gain in percent of MT/S so 400mhz would be a gain of 8.33%, your actual performance overall gain will be 0.83%, in trade you give up stability and longevity of the system.

[skOsH♥]

Look up the motherboard model on their website

Have a choice between the different serialized RAM kits

I misread your post....but yeah you'll want a kit that does EXPO, not XMP if you're going AMD.

[C1REX]

I have 7800x3D with Asus b650e-e so very similar.

There were no problems at all. EXPO profile works well with safe, low voltage. Just make sure to update your BIOS. And yes: 6000 CL30 is the sweet spot.

7800x3D is also amazing if you for some reason don’t want to use any overclocking at all. It loses very little performance without RAM profiles.

[Paraskeet]

did you already buy the hardware? I would wait until the 9000 x3d chips release. maybe you'll get a 65W 9800x3d that manages to be 10-20% faster + new boards that might have offer better value.
but to answer your question: yes cl30 6000MT/s is sweet spot.

[Paraskeet]

C1REX の投稿を引用：

I have 7800x3D with Asus b650e-e so very similar.

There were no problems at all. EXPO profile works well with safe, low voltage. Just make sure to update your BIOS. And yes: 6000 CL30 is the sweet spot.

7800x3D is also amazing if you for some reason don’t want to use any overclocking at all. It loses very little performance without RAM profiles.

now you made me curious. do you have any examples of this? if it's a video please post it here.

[Paraskeet]

C1REX の投稿を引用：

I have 7800x3D with Asus b650e-e so very similar.

There were no problems at all. EXPO profile works well with safe, low voltage. Just make sure to update your BIOS. And yes: 6000 CL30 is the sweet spot.

7800x3D is also amazing if you for some reason don’t want to use any overclocking at all. It loses very little performance without RAM profiles.

for anyone interested like I was. look up hardware unboxed "Is High-Speed Memory Worth It For Gaming? Stock vs. EXPO/XMP".
it seems like the non-vcache cpu like 7700x saw good performance gain when jumping from 5200 MT/s to 6000MT/s but the x3d chip was mostly negligible.

[Paraskeet]

I'm still wondering if by increasing the L3 cache beyond the 96MB, would be benefitial or even viable for amd. really interesting subject and I would like to know if CAMM2 is going to change that in the future once 8000-10000MT/s DDR5 is available.

whatever the case I think the next years are going to be interesting in the cpu/soc space. don't know about gpu but I don't think nvidia will sit on their laurels and let their competition take over

[Rod]

Why is there no ddr 5 6000mhz expo cl 28 26 24? They seemed of of stopped at CL30? latency > bandwidth for gaming.

[Illusion of Progress]

I would presume if none exists, it's not practical, if even possible, to achieve. It's not like every brand capable of producing DRAM and ICs would coincidentally and collectively decide "let's make this arbitrary point as our best even though better than that is obtainable". If something was obtainable and practical, they'd want to make a product offering it to cash in on that advantage and not let competitors have it all without even trying for a piece of that pie. But since none are doing it, I'd say that answers itself. It's either not possible, not practical, or not economically possible at scale they deem is worth it.

RAM manufacturers (and this goes for most hardware manufacturers) likely don't have gamers as the single, sole metric they cater to anyway. The extra bandwidth may still be a benefit of its own for some roles.

[Tonepoet]

This is based off of a statement by A.M.D's. technical director around the launch of Zen 4. You can read this Andantech article for details[www.tomshardware.com], and with the launch of Zen 5 being so soon (launch day is on the end of the month, and retailers have already gotten inventory) I wouldn't be surprised if the advice changed.

It is specific advice for Zen 4 processors, and this is based in part on cost, so with costs having changed so much things may have changed regarding where the sweet spot lies since then. I wouldn't necessarily discount faster ram if it's on-budget and doesn't cost much more, nor would I insist on 6000mhz 30 if not.

I saw somebody 'round here recommend that you divide the clockspeed by the latency to get an idea of how performant the R.A.M. is. I'm not sure if that's true or not but it seems like a reasonable method to me.

If you're upgrading from a 7700k, I might not worry about it though. You have D.D.R. 4 R.A.M, and you could upgrade to a 12600kf on a D.D.R. 4 motherboard for relatively cheap while getting a significant boost to your processing perf. I think an upgrade into a 12600kf with a 4070 Super would be a very respectable upgrade coming from a 7700k, and in that case, you could just give the R.A.M. you have currently one last hurrah on the LGA 1700 platform, if you buy a D.D.R. 4 compatible motherboard.

The upgrade path on LGA 1700 is admittedly little borked right now, since raptor lake processors are suffering from stability issues, likely stemming from overaggressive turbo behavior, but 12th gen. Alder Lake chips are unaffected insofar as anybody can tell and Intel promised a microcode update to fix the issue come august[www.theregister.com]. Should also be noted that Intel might not necessarily know what they're doing though, as they thought it was a problem with the B.I.O.S. before.

Of course, there's nothing wrong with going with AM5, but I might wait on the upcoming reviews for Ryzen 9000 series processors before committing to a given processor, especially since 7800x3D prices spiked a little recently, putting it in line with the anticipated cost of a 9900x.

[Iron Knights]

Max. MT/s for this CPU is 5200mhz, stick with that.
https://www.techpowerup.com/cpu-specs/ryzen-7-7800x3d.c3022

[Iron Knights]

As for the R7 7800x3D vs R9 7950x3D the R7 is the winner. Also beats the i9900x from Intel. In actual world, gaming performance. (not static benchmark)

[Tonepoet]

Iron Knights の投稿を引用：

As for the R7 7800x3D vs R9 7950x3D the R7 is the winner. Also beats the i9900x from Intel. In actual world, gaming performance. (not static benchmark)

I should have specified the Ryzen 9900x. You know, the processor that's due out next week for around the same price as the 7800x3D? 10% weaker at gaming[www.digitaltrends.com] isn't necessarily a deal breaker if it's substantively better at everything else I.M.H.O., which it will be.

[Rod]

Iron Knights の投稿を引用：

Max. MT/s for this CPU is 5200mhz, stick with that.
https://www.techpowerup.com/cpu-specs/ryzen-7-7800x3d.c3022

Offically yes. 6000mhz expo is an overclock. But no one buys 5200mhz... Everyone and thier granny uses 6000mhz expo. Its literally a bios toggle.


I would only buy 5200mhz c28 and even then to try to run it at cl 28 6000mhz otherwise it would be refunded for a 6000mhz cl30 expo kit with 32gb capacity.