You probably can’t hit max clock speeds on AMD’s Ryzen 9 7950X

By | 16/09/2022

Faster Than Threadripper: How I Overclocked Ryzen 9 5950X to 6 GHz and a World Record

My LN2 Pot got an imprint of the 5950X burned into information technology.

(Image credit: Tom’southward Hardware)

Ryzen 5000 series
CPUs from AMD landed a few weeks agone, and afterwards I’ve had near two dozen liquid nitrogen (LN2) overclocking sessions with chips with various core counts, the records are starting to autumn. These chips are just flying!

I would get every bit far as to say the marketing hype and multi-mean solar day-info-trickle that was the release actually


how skillful these processors are. I’m not just comparison Team Blood-red vs Team Blue here, but Squad Red mainstream vs Team Red high end desktop (HEDT) processors. In fact, the Ryzen nine 5950x on liquid nitrogen competes with water-cooled 64-core Threadrippers in the GPUPI benchmark for CPU 1B! This is jaw dropping and helps make it one of the
best CPUs
you can buy. More than on this later. Let’s see how these Ryzen ix 5950x’s perform from an extreme overclocker’s perspective.

Sytem Specs

CPU AMD Ryzen 9 5950X xvi Core
Motherboard ASRock X570 Taichi
CPU Cooler Enermax Aquafusion 360 AIO
Ability Supply Enermax Maxtytan 1250W PSU
Thermal Paste Thermal Grizzly Kryonaut Farthermost TIM

(Image credit: Tom’s Hardware)

I used the Enermax Aquafusion 360 for binning the fries. It kept the Ryzen ix 5950X in the 80C range at 1.35V and a 4.8 GHz clock charge per unit while withal managing to maintain depression fan speeds. It handled the 5950X’due south sixteen cores, which striking around 300 watts under load, without a glimmer of an eye. As you would imagine, the lower cadre-count Ryzen models are also not a problem. The Aquafusion’s three fans definitely assist to maintain better temps over a long period of time, and they don’t allow the loop to get saturated with heat. Also, my son loves the RGB.

I was lucky enough to examination half a dozen Ryzen 9 5950X’s, and they all savage inside a 100 MHz range of 4.75 to 4.85 GHz for Cinebench R15 on the Enermax water libation. That’s with a fixed-ratio overclock with no power savings enabled.

I used the new Thermal Grizzly Kryonaut Extreme thermal interface material (TIM) for all of my testing, and will proceed to use it for the time being. The company uses extra car grinding to brand the metallic particles smaller and more uniform. That provides the thinnest possible spread while still maintaining a crazy W/mK value. It’s expensive stuff, simply, naturally, the extra processing fourth dimension leads to higher production costs.

(Image credit: Tom’s Hardware)

For Vermeer, aka Zen 3 Ryzen 5000, we now have a grouping of eight cores per CCX, instead of a four-core grouping like the previous-gen Matisse chips. The Ryzen 9 5950X has two CCDs that each contain one eight-core CCX. In contrast, a previous-gen Ryzen 9 3950X has two CDDs with ii CCXes apiece, each containing four cores.

The new unified viii-core CCX alone is an efficiency boost considering those threads all need efficient advice with the L3 cache, and each other. And then now you don’t accept to worry equally much about an application spilling threads across multiple CCXes as much. Since the chips now have six to 8 active cores in a CCX, there isn’t a need to traverse the Infinity Fabric link quite as much. At present core-to-cadre communication tin can occur without going out to the IO die if the chip only uses a single CCD (six/8C CPU), which helps in a myriad of ways.

What does this mean for the states overclockers? With merely two CCXes to manage instead of iv, this also streamlines per-CCX independent overclocking. I have constitute that CCD 0 will always overclock better than CCD 1, by as much as 125 MHz in some cases. I would assume this is by design, which makes perfect sense.

If yous think nigh PBO and AMD’due south other features that boost clock speed, they will use the higher-binned chiplet CCD 0 for loftier frequency, and if more than threads are called, the processor will drib frequency a chip and load the CCD 1 threads while maintaining the power envelope figures. This technique gives y’all the benefit of very fast single and low core count performance, and the ability to but throw a ton of threads at greedy programs that require over viii.

The benefit to overclocking is I can ready, say, CCD 0 to an overclock of 4850 MHz and dial in a 4800 MHz overclock on CCD i. This increases my Cinebench R15 score by 100 points instead of existence limited to the max of CCD 1, which is 4800 MHz. At 4850 MHz on CCD 0 and 4800 MHz on CCD i, nosotros reach a score of 5470 marks in Cinebench R15. The Enermax Aquafusion 360 keeps the processor effectually 80C with 1.34V to the cadre, which is pretty solid.

(Image credit: Tom’s Hardware)

I really dear doing these articles with Tom’s because the large attain helps me shed some insight on the XOC (extreme overclocking) part of things. I have noticed in the comments that people tend to think that LN2 overclocking ruins the processors I exam. Shockingly plenty, information technology rarely causes any issues every bit far as chip deposition goes.

If y’all think about boost clocks for a minute, if your processor in some instances is hitting up to i.4-ish volts on auto settings, dialing in 1.65V on LN2 is not really that high, is information technology? Especially at -192C compared to a normal ambience cooling temperature of, say, 24-28C.

Allow’southward be clear, if whatsoever part I own degrades or gets hurt in whatever way I am gutted for days nigh it. This is not a “bench on LN2 and so throw away” type of bargain. I grind the same CPU over and over and over. I’chiliad chasing records, afterwards all.

(Image credit: Tom’south Hardware)

For liquid nitrogen overclocking, the Infinity Fabric is still the “limiting” cistron. The cold bug (where the processor no longer functions – 00 post code, meaning dead) is very flake-dependent, but in general, a lower fabric clock equals a amend power to use colder temperature. A scrap can often run -192C total-pot (pregnant the LN2 pot is full, providing maximum cooling) at a 1400 MHz material, just so accept a common cold bug at -125C with a 1600 MHz cloth.

So we have to bin the CPU

for core frequency, but for its power to run as cold as possible with the fabric dialed in every bit high equally possible. Out of the five Ryzen 9 5950x’s I have tried, just one is cold-bug-free with the fabric set at 1600 MHz. I think it’s a safe estimate to say that around twenty to 30% of the chips will do full-pot overclocking.

(Image credit: Tom’due south Hardware)

Back to the GPUPI benchmark for CPU. I managed to take the xvi-core earth record at a whopping 6050 MHz with the retentivity screaming at DDR4-4700 with 14-14-14-14-1t timings. The fabric limit was a little over 1600 MHz. This required 1.65V to the CPU core, simply I just needed 1.3V of SoC voltage. The pot temperature idled at -192C, and under load it heated up to effectually -188C. These chips are not crazy hot, at all.

(Epitome credit: Tom’s Hardware)

What makes this even more impressive is changing the perspective from sixteen cadre scores to include
core count. We can see the Ryzen 9 5950X is improve than the best Threadripper 3970X, even with both on liquid nitrogen. The 5950X also beats many Threadripper 3990Xs on custom air and water cooling, and is but browbeaten past LN2-cooled 64-core Threadripper 3990Xs. The 5950X’due south IPC and overclockability, too as the optimized CCX, all come up together to smooth bright in terms of functioning.

(Epitome credit: Tom’s Hardware)

The sheer performance I saw with the Ryzen ix 5950X still has me shocked that AMD was able to pull this off. In a style, the incremental upgrades we have seen for so long take left us eager for bigger jumps, and it’southward nearly like we are existence spoiled by a new line of CPUs this time.

It honestly feels similar AMD has skipped a generation and given us the meat and potatoes correct away instead of another titbit; I can’t look till we can have dessert (Threadripper 5000, anyone?).

(Epitome credit: Tom’s Hardware)

If you oasis’t picked one up, or tried to pre-order from the next batch of stock already, the Ryzen ix 5950X is the real deal and I would highly suggest checking it out if you are in the market for an upgrade (encounter our article on
where and how to buy Ryzen 5000 series), or just want to accept some overclocking fun. Happy overclocking!

 A world-champion competitive overclocker who frequently tops the charts at HWBot, a site which tracks speed records, Allen volition practise just about anything to push button a CPU to its limits. He shares his insights into the latest processors with Tom’south Hardware readers from a hardcore, push-information technology-to-the-limit overclocker’due south perspective.