frontpage Posted by the-press-box • Last Wednesday
Jun 11, 2025 4:27 AM
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frontpage Posted by the-press-box • Last Wednesday
Jun 11, 2025 4:27 AM
AMD Ryzen 7 9800X3D AM5 CPU + MSI MPG X870E CARBON WIFI Mobo 32GB DDR5 6000 CL36
+ Free Shipping$880
$972
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ASRock X870E Nova WiFi looks to be decent. Need to update the bios
**USB 40Gbps Type-C ports on the back panel and M2_2 slot share PCIe 5.0 x4 bandwidth. Both run at PCIe 5.0 x2 when a device is installed in the M2_2 slot. You can switch M2_2 to PCIe 5.0 x4 in the BIOS, but this will disable the USB 40Gbps Type-C ports. The USB4 host controller supports up to PCIe 4.0 x4.
but you have to deal with that with the Tomohawk board.
Running the GPU in x8 instead of 16 would really only affect someone with a 5090, since PCIE 5 x8 is the same as pcie 4 x16, and the 5090 only loses 0-3% performance loss on pcie4
and the MC combo uses a lower tier mobo than this one
https://rufus.ie/en/
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This is due to DDR5 having 1) two channels of 32 bit lanes instead of one channel of 64 bit lanes for each stick - so two different bi-directional signaling, 2) With the aforementioned doubling of signals running, the signals get affected as the motherboard traces all become active and introduce more noise when you start using all lanes with 4 sticks as opposed to two, and lastly 3) The PMIC or Power Management Integrated Circuit is now separated into each of the sticks instead of a single one residing on motherboard - so at higher speeds, the memory modules may have a harder time being in sync together and this is compounded by having 4 different PMICs controlling 4 different power management for each of the modules.
And this problem is not just Intel nor AMD. It's with both and regardless if you have better IMC in your new processor like the 9800x3d. You can even see tech youtubers like Linus' giveaway that was built in Taiwan (twice now with one of his latest videos) and Tech Notice also has the same problem from the very beginning: https://www.youtube.com/watch?v=pmCRg3j
TDLR: I suggest, don't add another pair of DDR5 that is unmatched even if they are the same brand UNLESS you know how to overclock memory. You have to get all 4 sticks bundled together if you don't know how to overclock or you're just wasting money buying XMP rated sticks that you have to run JEDEC / wayyy slower specs of the memory.
**USB 40Gbps Type-C ports on the back panel and M2_2 slot share PCIe 5.0 x4 bandwidth. Both run at PCIe 5.0 x2 when a device is installed in the M2_2 slot. You can switch M2_2 to PCIe 5.0 x4 in the BIOS, but this will disable the USB 40Gbps Type-C ports. The USB4 host controller supports up to PCIe 4.0 x4.
but you have to deal with that with the Tomohawk board.
Running the GPU in x8 instead of 16 would really only affect someone with a 5090, since PCIE 5 x8 is the same as pcie 4 x16, and the 5090 only loses 0-3% performance loss on pcie4
Thank you that was helpful! Just getting back into this realm after 10+ yrs
You don't lose any noticeable performance. It just makes it harder to overclock memory. It won't matter for 99% of people buying this.
Free 16x2 GB DDR5 Memory and 1TB SSD w/ purchase while supplies last
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