News AMD Suggest Possible Fixes for USB Connectivity Issues

[spongiemaster]

The 4GB RX5500 can be up to 70% faster on 4.0 than 3.0, so 4.0 is starting to pay dividends at the low-end where GPUs need fast access to system memory to offset their VRAM deficit. That makes me optimistic about how well the 3050(Ti) will perform despite still having only 4GB once Nvidia gets around to launching it.

But isn't that also a result of it being limited to 8x? The card was artificially limited to begin with. If the card was 3.0 16x it would have seen the same doubling of bandwidth and thus same performance improvement as moving to 4.0 8x.

 

[InvalidError]

If the card was 3.0 16x it would have seen the same doubling of bandwidth and thus same performance improvement as moving to 4.0 8x.

Had the RX5500 been x16, it would likely also have performed another 10-20% better on 4.0x16 since the 8GB models clearly show that the 4GB ones still leave 20-30% of GPU's performance on the table in more VRAM-heavy scenarios on 4.0x8.

In other words, the 4GB RX5500 clearly demonstrates that 3.0x16 or 4.0x8 is barely sufficient for last-gen 4GB GPUs.

 

[spongiemaster]

Had the RX5500 been x16, it would likely also have performed another 10-20% better on 4.0x16 since the 8GB models clearly show that the 4GB ones still leave 20-30% of GPU's performance on the table in more VRAM-heavy scenarios on 4.0x8.

In other words, the 4GB RX5500 clearly demonstrates that 3.0x16 or 4.0x8 is barely sufficient for last-gen 4GB GPUs.

AMD really crippled this product for its target audience. 4GB 5500XT users are losing upwards of 70% of their performance because AMD went with 8x. 10-20% isn't worth upgrading your entire platform for, 70% definitely would be, but if you were the original target market for this card (About $150), you probably don't have the funds to upgrade the entire platform to a 4.0 compliant one. Right now, PCIE 4.0 is a mismatched target market/beneficial market feature. It's only available at the higher end, but it's most beneficial to the lower end.

 

[InvalidError]

10-20% isn't worth upgrading your entire platform for

That will likely increase to 30-50% with next-gen 4GB GPUs.

Right now, PCIE 4.0 is a mismatched target market/beneficial market feature. It's only available at the higher end, but it's most beneficial to the lower end.

To be fair, the main reason boards with PCIe 4.0 support are ~$30 more expensive than older boards is largely due to 500-series boards having VRMs with twice as many phases if not more along with a bunch of other unrelated bells and whistles. PCIe 4.0 worked fine on many cheap B450 boards until AMD decided to take it away instead of letting people enjoy non-official support if it works for their specific CPU+board+GPU+NVMe combination.

 

[PlasmaTorus]

Insufficient System on Chip voltage may be the cause as it is related to the stability of the integrated USB controller. After reflashing the BIOS and resetting to system defaults, disabling turbo, ceasing the use of all tweaking tools, uninstalling the USB drivers and deleting them and clean installing them, visiting the properties of every USB port and root hub in device manager and disabling allowing to shut off the device to save power, disabling USB selective suspend in the power plan, and confirming a full pass on Passmark MemTest, one might want to confirm there is nothing wrong with any of the attached devices by running them on another system or using a third-party USB to PCIe expansion card to isolate the issue to the board's USB controller. Once isolated this would be grounds for an RMA of the motherboard, as it does not function properly at default settings. Since the problem is not universal, some motherboards may have received insufficient validation testing. I don't own a dysfunctional system like this and can't experiment on the problem myself.