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Finally time for new computer

Post Date: 2022-12-26
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Alci View Drop Down
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Posts: 250 		  Quote Alci Quote  Post ReplyReply bullet Topic: Finally time for new computer
    Posted: 26 Dec 2022 at 7:54pm
I mainly game in 3440x1440, but would like option to use multicore work stuff. I have two choices and would like opinions. My primary questions are
1. What is the real world difference between 2 channel and 8 channel memory?
2. Will the DDR5 memory for the 2 channel memory offset the DDR4 8-channel memory in terms of speed?
3.Will the cheaper config be adequate in terms of pci-e lanes for a 4090 GPU and 2 NVMe sticks?

Config 1: 4582472
Config 2: 4582469

FYI my current computer is a 2014 DS that just crashed  with a CPU fan error. Noctua DH-14 finally died after almost 9 years.

thx in advance for suggestions.
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JamesAstro View Drop Down
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Posts: 624 		  Quote JamesAstro Quote  Post ReplyReply bullet Posted: 26 Dec 2022 at 9:39pm
I'm not the best person to answer your questions about memory speed and PCI-E lanes. However, I do have some thoughts about how much memory you selected. Your more expensive config has 64 GB of memory. 32 GB will be more than enough for gaming, and 64 GB would be total overkill. However, it might be handy if you're using some memory hungry apps like Photoshop, Premiere, or After Effects.
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Posts: 7331 		  Quote Cretae Quote  Post ReplyReply bullet Posted: 27 Dec 2022 at 10:06am
1. Depends on your workload. I've read dual channel holds it's own vs 8 channel with the exception of "science workloads" and encoding.

2.Unless your workload is of either or both the exceptions noted, the significantly faster DDR5 should beat out the DDR4 every time.

3. Adequate, certainly. Optimal? I don't know enough about the tasks you're into to comment, and doubt I know enough in any case.

The difference in raw computing power between the two processors you're considering is not terribly significant no matter the workload IMHO. I'm looking at this:

https://www.cpubenchmark.net/compare/AMD-Ryzen-Threadripper-PRO-5965WX-vs-AMD-Ryzen-9-7950X/4768vs5031

Considering the Threadripper is almost 4x the cost, I don't see you getting your money's worth. Since it seems gaming may still be your primary use, The 7950 will do a much better job of that.   
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Posts: 392 		  Quote MrCheetah Quote  Post ReplyReply bullet Posted: 27 Dec 2022 at 1:37pm
Originally posted by Alci

1. What is the real world difference between 2 channel and 8 channel memory?

It's going to depend on the tasks/workload.

AMD Threadripper PRO Memory Channel Performance Scaling | Puget Systems


Originally posted by Alci

2. Will the DDR5 memory for the 2 channel memory offset the DDR4 8-channel memory in terms of speed?

Impact of DDR5 Speed on Content Creation Performance | Puget Systems

DDR5 vs. DDR4 Benchmarks on Intel i9-12900K (Alder Lake Memory Comparison) | Gamers Nexus (YouTube)

Ultimately, it does not appear to me the bandwidth difference of DDR4 vs. DDR5 is anywhere near quadrupling DDR4 memory channels. But, again, the performance difference and value is dependent upon if the task is memory intensive.


Originally posted by Alci

3. Will the cheaper config be adequate in terms of pci-e lanes for a 4090 GPU and 2 NVMe sticks?

Yes.

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Posts: 2115 		  Quote db188 Quote  Post ReplyReply bullet Posted: 27 Dec 2022 at 2:28pm
for the costs, there's really no value to anyone not running servers/pro workstation usage.

you'll get more than enough multi core performance for workloads, while superior gaming performance with the Intel I9-13900KS over the AMD Ryzen Threadripper Pro 5965X. 

as for comparing Raptor Lake to Ryzen, you get iirc about 5% more multi core performance out of the I9-13900K over the Ryzen 9 7950X, while Ryzen has slightly better single core performance. 

"future proofing" is rather subjective.  Raptor Lake is end of life.  Intel will be going to a "chiplet" design going forward, so you won't be able to upgrade the platform. that being said, either 1 of these current builds will be good for most people for many years.  the up front total system costs favor Intel if using DDR4 and older motherboards with just a Bios update needed. 

personally, i'm springing for a new AMD build, returning after many years to when i had an FX-57 based pc!  you might consider an Intel build if you have workload+gaming balanced needs.   


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Alci View Drop Down
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Posts: 250 		  Quote Alci Quote  Post ReplyReply bullet Posted: 27 Dec 2022 at 3:30pm
Pulled the trigger with 4583095. I know the intel chip is a little better for gaming, but I read power consumption was higher which made me concerned about heat with the AIO cooler and it just irritates me that it only had 20 pci-e lanes. It feels like I'll need the 24 that the 7950 has to support GPU and 2 NVMe sticks.
Does it really matter though? Thx for the assistance.
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MrCheetah View Drop Down
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Posts: 392 		  Quote MrCheetah Quote  Post ReplyReply bullet Posted: 27 Dec 2022 at 7:16pm
Not to change your decision at all, just an additional FYI:

Intel's latest essentially has 24 PCI-E 5.0 and four PCI-E 4.0:



From what I've found Intel's DMI 4.0 interface has about equal bandwidth as PCI-E 4.0. So, the CPU to chipset connection is about equivalent to 8x PCI-E 4.0 or 4x PCI-E 5.0.

However, there is one more thing...

As you can see in the above diagram (which is basically similar on AMD's platforms), those eight (or four on some series) need to handle almost all of the extra I/O traffic (e.g., USB, SATA, networking, additional M.2 slots).

Indeed, this is where (presumably/understandably) AM5 excels a bit. The specs appear to support up to two full-speed (i.e., four lanes) M.2 slots connected directly to CPU versus the previous generations common four dedicated lanes to a single M.2 slot (typically, sensibly the one directly beside the CPU socket).
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Posts: 2115 		  Quote db188 Quote  Post ReplyReply bullet Posted: 27 Dec 2022 at 7:38pm
you Gen 5 x16 lanes to gpu, Gen 5 x4 lanes direct from cpu to pcie storage device, and 4 more Gen 4 interconnect via the chipset.  you could upgrade your mobo to an X670E for more Gen 5 connection for $200+ more. 
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