AMD X590 Chipset Pops Up Again - 24 Full PCIe 4.0 lanes instead of 16?

by Hilbert Hagedoorn on: 06/16/2019 09:44 AM | source: computerbase | 33 comment(s)

In the past, we've mentioned an X590 chipset alongside the AMD X570 chipset. At the time I think AMD denied an X590 chipset, guess what? The name is now resurfacing. Short term you may expect the X570, B550 and A520 chipsets right?

Well, a while ago on 1Usmus's Twitter account (the tweet has since disappeared) a rumor was spread that the X590 chipset would arrive. And that now is becoming a little more credible in terms of information as an image has been published in a forum post , indicating that the X590 chipset is referred to in the bios of various X570 motherboards.

Computer base forum user CM87 noticed that in the official BIOS for X570 motherboards the X590 chipset is mentioned. If all this is true, we have no idea what the real differences could be. A new Threadripper chipset (if even released) would likely be named X599 right? There has been talk about the ASMedia PCH at PCIe 4.0, which could be the difference. But if that is all, it would not warrant a new chipset name IMHO. As you know, AMD uses the X570's design of the I/O dies of the Ryzen 3000 CPUs. There are a total of 24 PCIe 4.0 lanes on the processors, four of which are reserved for the interlink to the chipset. The X570 has 16 PCIe lanes plus four for the uplink to the processor. Perhaps the new X590 chipset has a full 24 PCIe lanes as that is the only tangible different I think of.

For the time being let's take this info with a pinch of salt.

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Evildead666
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#5681232 Posted on: 06/16/2019 12:07 PM

Maybe its a TDP choice ?
They could do a WS board, but just 4 extra PCIe lanes is weak, and X570 are going to be expensive anyway.

An x8 link to the chipset ? (get rid of any bottlenecks, perceived or otherwise).

DmitryKo
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#5681234 Posted on: 06/16/2019 12:16 PM

There would be little benefit from the extra 8 PCIe lanes in the PCH, as all these 24 lanes would map to the same 4-lane CPU uplink.

Now if they could reconfigure the CPU NVMe x4 link to double as the downlink lanes to the chipset...

Evildead666
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Joined: 2003-09-14

#5681236 Posted on: 06/16/2019 12:20 PM

There would be little use for the extra 8 PCIe lanes in the chipset as they all go through the same 4-lane uplink to the CPU.

Now if they could reconfigure the x4 NVMe link in the CPU to double on the downlink lanes to the chipset...
Then again, it would basically have one M2 slot less than X570, but have a x8 link to the chipset..not sure if worthy of X590.
There must be more to this, maybe even E-ATX boards.

edit : Microsemi has a storage PCIe 4.0 switch available since last year, and PLDA might have one. Broadcom could have one too (PLX chips).

HWgeek
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#5681239 Posted on: 06/16/2019 12:25 PM

Evildead666
Senior Member

Posts: 1308
Joined: 2003-09-14

#5681243 Posted on: 06/16/2019 12:44 PM

Can they make 8 Dimms memory board? or maybe 4ch 8 Dimms board?
Since now they are at X299 league with 3900X/3950X and it's need more memory dimms slots or quad Chanel memory.
*TR X599 will be another league, no cannibalization.
The problem is the number of pins for the socket.
TR is so big, mainly due to the extra memory channels.

AM4 and AM5 will be dual channel.
Each memory leap DDR3/4/5 is about twice as fast as the last now, with a bit of regression, but doable
much cheaper than finding an extra 288 pins, per channel, for DDR4

edit : Also, i don't think its possible to do more than 2 Dimms per channel. So we are stuck at 4 Dimms, which is still quite good. 128GB max i think, with 32GB dimms.

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