Does Memory Speed Matter for the 7800X3D?

In this video, the fourth in our "Ultimate PC Component Fighting Championship" series, we answer the question: "Does Memory Speed Matter for the 7800X3D?" Our UpcFC battle series is focused on helping you make the tough choices when building your dream PC. Choices like should I buy CPU X or CPU Y, should I buy GPU X or GPU Y, should I use an air cooler or AIO, these are all profound life changing questions that we take very seriously here at Blackbird PC Tech. In this series we are going to help you make the right choice by pitting two components against each other in the PC octagon to see who wins. For this video our focus will be on DDR5 memory, specifically for the AMD AM5 platform, with DDR5-6000 in the red corner taking on DDR5-8000 in the blue corner.

Remember, it's not rocket science, it's Lego … my goal is to help you make the right component choices and put them together the right way, every time.

Chapters:
00:00 Introduction
00:12 UpcFC Series Overview
00:49 AM5 Platform & DDR5 Issues
03:41 Test Setup & Methodology
05:30 Benchmarks featuring Bruce Buffer
07:16 AM5 Long Boot Time Solution
08:44 The Winner Is Crowned
09:58 Wrap-Up

Thank you for watching this video in the "Ultimate PC Component Fighting Championship” battle series. If you enjoyed today's video please hit that like button and subscribe so that you don't miss out on future episodes as other components battle it out in the PC octagon. Please also comment and offer suggestions on any future components that you would like to see go head-to-head.

Blackbird PC Tech Links:

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Memory Testing Software Links:

[atishalii]

Liked and subscribed !!! I'm about to jump to full Red team and I've been told to pay very attention to Ram kits but with your video it is clear as water !!! Thanks !

[appleipodtouchg]

Its so funny, I hardly hear anyone complain about stability issues with XMP kits but always hear about EXPO kits and stability issues. I’ve been running an XMP 6400 kit on my 7600x with zero issues and that was even before AGESA bios updates.

[yackemup]

Updating bios can also help with even better stability AND also allow for more different types of memory and speeds to be used. The MB I have has had bios updates to allow faster memory kits to be used....

[humer]

In my case, the boot time stock is 64, which means it was a USB device that the board did not recognize. I traced 1/1 and found out that it was an external hard drive doing the thing; I disconnected it, and the boot time is equal to ddr4 memory now. I have the X670E Gigabyte Aurus Extreme.

[alifleming]

Couldn't figure out why my system was taking a while to boot for a long time and the solution is randomly in this video about memory speed!! Legend

[johnmoore]

Ryzen 7000 series still prefers low latency RAM over higher MHz. LTT did a test 8-10 months ago showing 5600 CL28 performed just as well as higher MHz kits with higher latency timings.

It’s what I recommended my friend to get with his 7800X3D recently. I’d rather have him be stable, fast, and cheap instead of potentially having to tinker with the RAM and have it cost more for an extra 1-2%.

Obviously you can try to manually lower timings to match the 5600Mhz kit while using a higher clock speed, but that’s too much messing around for 95%+ of people.

[BulletPrfGAmr]

Thanks for the content! I fully agree performance vs cost the 6000 kit is best bang for buck when considering especially that for most systems in AM5 platform will be very stable with the 6000 and likely more unstable with the 8000 kit

[micbrd]

Interesting, thanks for the tests, it is hard to tell from your numbers did you test any heavily CPU limited situations in the games? This is generally where you will see memory scaling well and increasing FPS. That 3D v cache does help to reduce the need for very high MT/s memory as long as the game title uses the cache well.

On a Intel 13900K @5.5 Ghz (E cores turned off) I tested memory scaling from DDR5 5600 MT/s up to 7200 MT/s and there is around 10% improvement in FPS from faster clock speed RAM when CPU limited.

[BrandensOutdoorChannel]

DDR5 6000 is the sweetspot. high speed kits are made for competitive overclocking.

[KaPonoo]

I think anytime the U Clock is cut in half it decreases performance

[fonolavalencia]

very informative, went for 6400mhz CL32 on my new 7800x3d rig. I hope my Asrock X670E Pro RS motherboard have that setting you say for faster boot.

[jemborg]

Thanks heaps for this mate. Much appreciated. 👍

[maveric]

Strange my results were quite different but i compared with bclk 102. With almost the same aida latency around 60ns with 7800x3d for both freq, the 8000 was usually 10% faster, sometimes even 15% in games like msfs2020. But nice work well done. I believe that when the game uses 2-4 cores mostly and need a lot of bandwidth the 8000 is just faster. Also mine 8000 wasnt stable, just like 10 min enough for test. But sometimes it was, depending of system boot, probably smth was on the edge or just the latest bios isnt good enough

[jamescook]

Great information again please keep up the great work

[machinimaaquinix]

Thanks for the clear comparison and short video. This will def drive my decision when I build my new AMD system in Feb. You got a new sub. o/

[oOooooooooyeah]

I've got 7000 running on my 7950X now and it works perfect.

[SRguy]

Thank you, Thank you, Thank you!!! Built my new AM5 system almost 6 months ago and have always dreaded reboots because of the long times. "Auto means Disabled" in Memory Context Restore is crazy, but sure enough when I set it to Enabled all my issues went away.

[grtitann]

Unlike all the "very original" tubers (you know, the ones that act like only ngreedia makes gpus), I love that AMD GPU in the background, which equals automatic up vote and new subscriber!.

Keep up the good work.

[Nayah]

If you own an ASUS board, they have RAM OC profiles in their BIOS under DRAM settings for every die (Hynix, Samsung and Micron).
For instance, with my 2x32GB EXPO sticks of G.Skill Trident Z5 Neo RGB, I went from 6000MHz CL30 to 6400MHz CL32 just by turning on a preset in the ASUS BIOS.
I've measured considerable gains across the board in AIDA64 Extreme. CPU is a 7950X. Here are the results:

6400MHz CL32 profile:
Read: 86 GB/s
Write: 94 GB/s
Copy: 80 GB/s
Latency: 61 ns

6000MHz CL30 (EXPO ON):
Read: 76 GB/s
Write: 82 GB/s
Copy: 71 GB/s
Latency: 71 ns

4800MHz CL40 (EXPO OFF):
Read: 66 GB/s
Write: 69 GB/s
Copy: 61 GB/s
Latency: 82 ns

[greeneyedvillain]

I'm liking this video based on Icingdeath & Twinkle being in the background.