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Bandwidth and memory speed of the 9950x CCD are key factors.

Bandwidth and memory speed of the 9950x CCD are key factors.

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Fabi201206
Member
55
08-15-2022, 07:42 AM
#1
I found information about the older 7950x model. Each CCD operated up to 2000Mhz, which restricted the CPU's bandwidth to 64GB/s. This speed limit was a key factor when trying to boost performance with faster DDR5 RAM. For the newer 9950x, I’m looking for its current CCD frequency and bandwidth specs, as well as the expected out-of-the-box speed for 4x DDR5 48GB RAM sticks.
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Fabi201206
08-15-2022, 07:42 AM #1

I found information about the older 7950x model. Each CCD operated up to 2000Mhz, which restricted the CPU's bandwidth to 64GB/s. This speed limit was a key factor when trying to boost performance with faster DDR5 RAM. For the newer 9950x, I’m looking for its current CCD frequency and bandwidth specs, as well as the expected out-of-the-box speed for 4x DDR5 48GB RAM sticks.

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okA_
Member
141
08-24-2022, 03:29 PM
#2
It's identical, possibly functioning at 2133MHz with a 6400MT RAM setup. The details appear limited.
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okA_
08-24-2022, 03:29 PM #2

It's identical, possibly functioning at 2133MHz with a 6400MT RAM setup. The details appear limited.

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Machimine
Member
64
09-12-2022, 01:53 AM
#3
Infinity Fabric frequency (FCLK) should remain consistent at 2000MHz by default on Ryzen 9000, matching the 7000 model. Both chips share the same bus width, so performance should be around 64GB/s per CCD. Starting with the default speed of 3600MT/s, it’s unclear how much higher it can go, but it likely won’t exceed the 7000 series’ peak of 4000–4400. It seems unlikely to surpass that range significantly, especially since Ryzen 9000 adapts IO dies from its predecessors for higher configurations.
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Machimine
09-12-2022, 01:53 AM #3

Infinity Fabric frequency (FCLK) should remain consistent at 2000MHz by default on Ryzen 9000, matching the 7000 model. Both chips share the same bus width, so performance should be around 64GB/s per CCD. Starting with the default speed of 3600MT/s, it’s unclear how much higher it can go, but it likely won’t exceed the 7000 series’ peak of 4000–4400. It seems unlikely to surpass that range significantly, especially since Ryzen 9000 adapts IO dies from its predecessors for higher configurations.

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Sampsonn634
Member
59
09-13-2022, 05:48 AM
#4
I recall hearing that the IOD on the 9950x matches the 7950x. The Ryzen 7000 "Raphael" and Granite Ridge systems merge one or two "Zen 5" CCDs, each fabricated on TSMC's 4 nm process, with a client I/O die (cIOD) crafted on the 6 nm node. DDR5-6400 confirmed as the sweetspot speed for Ryzen 9000 "Zen 5" desktop chips. It seems a better selection from the 6nm process would likely exist if they hadn't altered it. The AUTO:1:1 design of AM5 suggests the CCDs are less concerned with MCLK:UCLK clock speeds, focusing more on IOD. On AM4, the 1:1:1 setup with FCLK directly impacted RAM speeds through the infinity fabric, a situation that doesn't apply to AM5.
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Sampsonn634
09-13-2022, 05:48 AM #4

I recall hearing that the IOD on the 9950x matches the 7950x. The Ryzen 7000 "Raphael" and Granite Ridge systems merge one or two "Zen 5" CCDs, each fabricated on TSMC's 4 nm process, with a client I/O die (cIOD) crafted on the 6 nm node. DDR5-6400 confirmed as the sweetspot speed for Ryzen 9000 "Zen 5" desktop chips. It seems a better selection from the 6nm process would likely exist if they hadn't altered it. The AUTO:1:1 design of AM5 suggests the CCDs are less concerned with MCLK:UCLK clock speeds, focusing more on IOD. On AM4, the 1:1:1 setup with FCLK directly impacted RAM speeds through the infinity fabric, a situation that doesn't apply to AM5.

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YeshasNZ
Member
159
09-13-2022, 01:49 PM
#5
As far as I am aware, one of the reviews got the 9700X to run with FCLK at 2133 with the RAM at 6200 or 6400 MHz with 1:1 FCLK ratio. But the thing is, most of the reviewers aren't even running RAM at the same speeds as Ryzen 7000. Due to launch driver issues as well as instability, I believe Steve (GN) ran his 9950X with RAM at 5600MHz and Jay ran his at 5200MHz. At this point I believe the only way we are even going to see the full performance of Ryzen 9000 series in general is to wait for the new 800-series MotherBoards and some BIOS updates. Its been clear from the very first review that the CPUs aren't running 100% correctly and plenty of the reviewers have expressed frustration over it already.
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YeshasNZ
09-13-2022, 01:49 PM #5

As far as I am aware, one of the reviews got the 9700X to run with FCLK at 2133 with the RAM at 6200 or 6400 MHz with 1:1 FCLK ratio. But the thing is, most of the reviewers aren't even running RAM at the same speeds as Ryzen 7000. Due to launch driver issues as well as instability, I believe Steve (GN) ran his 9950X with RAM at 5600MHz and Jay ran his at 5200MHz. At this point I believe the only way we are even going to see the full performance of Ryzen 9000 series in general is to wait for the new 800-series MotherBoards and some BIOS updates. Its been clear from the very first review that the CPUs aren't running 100% correctly and plenty of the reviewers have expressed frustration over it already.