The Intel 12th Gen Core i9-12900K Review: Hybrid Performance Brings Hybrid Complexity
by Dr. Ian Cutress & Andrei Frumusanu on November 4, 2021 9:00 AM ESTCPU Benchmark Performance: DDR5 vs DDR4
Traditionally we test our memory settings at JEDEC specifications. JEDEC is the standards body that determines the requirements for each memory standard. In this case, the Core i9 supports the following aligning with those standards:
- DDR4-3200 CL22
- DDR5-4800B CL40*
There's an * next to the DDR5 for a couple of reasons. First, when asked, Intel stated that 4800A (CL34) was the official support, however since the technical documents have now been released, we've discovered that it is 4800B (CL40). Secondly, 4800B CL40 technically only applies to 1 module per 64-bit channel on the motherboard, and only when the motherboard has two 64-bit slots to begin with. We covered Intel's memory support variants in a previous article, and in this instance, we're using DDR5-4800B memory in our testing.
As explained in our SPEC section, DDR5 memory not only brings bandwidth improvements but also the increased number of channels (4x32-bit vs 2x64-bit) means that the memory can be better utilized as threads pile on the memory requests. So while we don't see much improvement in single threaded workloads, there are a number of multi-threaded workloads that would love the increased performance.
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Netmsm - Monday, November 8, 2021 - link
@Wrs Assume we give you this, just drop AMD related things.Let's focus on performance per watt of new Intel Architecture. I asked some questions about this which is a pertinent topic to this article but you dodged. Just talk about 241 watt being sucked by 12900k :))
ajollylife - Sunday, November 7, 2021 - link
To be fair Intel's def not perfect. The i225v lan bug comes to mindDominionSeraph - Saturday, November 6, 2021 - link
When Intel doesn't have this issue it is AMD.Intel demands validation and spends hundreds of millions on engineers to help motherboard manufacturers fix their issues before release because they realize that the motherboard is an INSEPERABLE part of the equation. You can fanboi all you want over the CPU, but if there are no good motherboards you have a terrible system.
AMD just dumps their chip on the market, leaving the end-user with a minefield of motherboard issues among every manufacturer.
When Intel has the problem solved but AMD doesn't, it's an AMD issue.
Qasar - Saturday, November 6, 2021 - link
DominionSeraph have you tried this on a different x570 board ? it COULD be just that board, as was already stated. i have been running a 5900x now for about a week, and no issues at all with disk access, its the same as the 3900x i replaced, and im using an asus x570 e-gaming board.maybe take a step back, realize that its NOT an amd issue, but a BOARD issue. to be fair, intel has had its own issues over the years as well, while you see them as perfect, sorry to break it to you, but intel also isnt perfect
Netmsm - Sunday, November 7, 2021 - link
Oh I got it, the fact that you're encountering unusual issues, despite myriads of people who haven't complained of the same problem you have, means that AMD got many incompatibility issues.That's a brilliant reasoning which brings us to a pure conclusion: AMD is bad. We're done here.
Dug - Monday, November 15, 2021 - link
@DominionSeraph"Note Intel doesn't allow "dog sh1t motherboards" to happen, especially at the $300+ price point. That makes it an AMD issue."
You obviously haven't looked at or experienced the issues that plague many motherboards. Maybe just read some reviews or visit manufactures forums to get an idea of how bad it is before making such a naïve statement.
It has more to do with the manufacturer of the board than the CPU.
That is like saying nvidia doesn't make crap video cards. Well you need to look at all the failures by each manufacturer, not nvidia itself.
madseven7 - Saturday, November 6, 2021 - link
You put that chip in an ASROCK motherboard. That's the reason for the issues.xhris4747 - Tuesday, November 9, 2021 - link
Lol 😅FLORIDAMAN85 - Friday, November 12, 2021 - link
I, too, have made the error of purchasing an ASRock board.mode_13h - Saturday, November 13, 2021 - link
So far, my ASRock Rack server board is still going strong.