Guru3D Rig of the Month - February 2021
ASUS GeForce RTX 3060 STRIX Gaming OC review
EVGA GeForce RTX 3060 XC Gaming review
MSI GeForce RTX 3060 Gaming X TRIO review
PALIT GeForce RTX 3060 DUAL OC review
ZOTAC GeForce RTX 3060 AMP WHITE review
Fractal Design Meshify 2 Compact chassis review
Sabrent Rocket 4 PLUS 2TB NVMe SSD review
MSI Radeon RX 6900 XT GAMING X TRIO review
Guru3D Q1 Winter 20/21 PC Buyer Guide
AMD: Pre-X570 boards will not support PCIe Gen 4
Yes, that's what he said. Actually, AMD's Robert Hallock said that on Reddit. earlier on some motherboard manufacturers showed PCIe Gen 4.0 support in series 400 BIOSes.
And that confirms it plain and simple. The new 500 series chipset will support PCIe express Gen 4.0 in combination with Ryzern 3000 processors. Anything below, simply not. Whether or not you'll find PCIe 4.0 a buying feature is also topic of debate, your GPU certainly will not need that bandwidth, and while PCIe Gen 4.0 based NVMe SSD(s) are fun, would you truly really need 5000 MB/sec in SSD performance, other than for bragging rights of course .
"Hallock: This is an error we are correcting. Pre-X570 boards will not support PCIe Gen 4. There's no guarantee that older motherboards can reliably run the more stringent signaling requirements of Gen4, and we simply cannot have a mix of "yes, no, maybe" in the market for all the older motherboards. The potential for confusion is too high. When final BIOSes are released for 3rd Gen Ryzen (AGESA 1000+), Gen4 will not be an option anymore. We wish we could've enabled this backwards, but the risk is too great."
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| PCIe Version | Line Code | Transfer Rate | x1 Bandwidth | x4 | x8 | x16 |
| 1.0 | 8b/10b | 2.5 GT/s | 250 MB/s | 1 GB/s | 2 GB/s | 4 GB/s |
| 2.0 | 8b/10b | 5 GT/s | 500 MB/s | 2 GB/s | 4 GB/s | 8 GB/s |
| 3.0 | 128b/130b | 8 GT/s | 984.6 MB/s | 3.938 GB/s | 7.877 GB/s | 15.754 GB/s |
| 4.0 | 128b/130b | 16 GT/s | 1.969 GB/s | 7.877 GB/s | 15.754 GB/s | 31.508 GB/s |
schmidtbag
Senior Member
Posts: 5634
Joined: 2012-11-10
Senior Member
Posts: 5634
Joined: 2012-11-10
#5676403 Posted on: 06/03/2019 09:56 PM
Do you even know if your board will support the 3000 series? Because not all B350 boards can or will. Does it have an 8-pin CPU power connector? Is there a heatsink on the VRM?
If the answer to each of those questions is "yes" then I'm sure you could run the 3800X on it, but bear in mind the XFR performance will likely be lacking, so you're not going to get the full performance you paid for.
What do you guys think about pairing a 3800x CPU on a b350 motherboard ? No overclocking , just stock speeds. Would I get away with murder ? Best bang for buck ?
Do you even know if your board will support the 3000 series? Because not all B350 boards can or will. Does it have an 8-pin CPU power connector? Is there a heatsink on the VRM?
If the answer to each of those questions is "yes" then I'm sure you could run the 3800X on it, but bear in mind the XFR performance will likely be lacking, so you're not going to get the full performance you paid for.
Astyanax
Senior Member
Posts: 9477
Joined: 2018-03-21
Senior Member
Posts: 9477
Joined: 2018-03-21
#5676428 Posted on: 06/03/2019 11:45 PM
Robert Hallock is also known for being wrong.
Robert Hallock is also known for being wrong.
insp1re2600
Senior Member
Posts: 1492
Joined: 2018-01-03
Senior Member
Posts: 1492
Joined: 2018-01-03
#5676430 Posted on: 06/03/2019 11:48 PM
my x470 board recieved a beta bios that now has an option to switch between pci-e gens in the cpu options.
my x470 board recieved a beta bios that now has an option to switch between pci-e gens in the cpu options.
Astyanax
Senior Member
Posts: 9477
Joined: 2018-03-21
Senior Member
Posts: 9477
Joined: 2018-03-21
#5676431 Posted on: 06/03/2019 11:48 PM
PCIE is a negotiated link, it will already automatically Down-Link when too many errors are reported during pci-e training.
my x470 board recieved a beta bios that now has an option to switch between pci-e gens in the cpu options.
be our test subject >
If it does not work, reset BIOS. Same as with certain memory configurations preventing board form realizing it can't get it working.
PCIE is a negotiated link, it will already automatically Down-Link when too many errors are reported during pci-e training.
my x470 board recieved a beta bios that now has an option to switch between pci-e gens in the cpu options.
my x470 board recieved a beta bios that now has an option to switch between pci-e gens in the cpu options.
be our test subject >
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What do you guys think about pairing a 3800x CPU on a b350 motherboard ? No overclocking , just stock speeds. Would I get away with murder ? Best bang for buck ?