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Author Topic: Catweasel MK3 and Tabor  (Read 4282 times)

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Offline First Ninja

Re: Catweasel MK3 and Tabor
« on: January 26, 2020, 01:29:25 AM »
Quote from: kamelito;818600
When I read the AEON PDF about the A1222 I thought that it has 2 PCIe, No?
-x4 PCIe gen 1 link allows data rates of 2.5Gb/s per lane
-x16 PCIe connector to support RadeonHD graphics cards
Kamelito

It has just one slot that's mechanically x16 but electrically x4.

Would you mind elaborating on this a bit futher, please? The (newly updated) specification says the Tabor features the following:

> x4 PCIe gen 1 link allows data rates of 2.5Gb/s per lane
> x16 PCIe compatible connector to support Radeon RX graphics cards


Does that equate to one or two physical PCIe slots/connections?
Karate, Jerry. Karate. It's the lifetime pursuit of balance and harmony.
 

Offline First Ninja

Re: Catweasel MK3 and Tabor
« Reply #1 on: January 26, 2020, 01:52:55 PM »
"x16 PCIe compatible" doesn't mean it's a x16 slot. It means if you put a x16 PCIe card in there it'll physically fit and work.

The way PCIe works is it's connectors are made up of a varying number of lanes, which is what the "x4" or "x16" refers to. You only need one lane for PCIe to work, and extra ones just make it faster.

So when you say "x4 PCIe link" and "x16 PCIe compatible connector", what that means is that the connector is the correct size for a 16x card to fit, but only wired up for x4. The extra pins don't connect to anything, but it's compatible in the sense something plugs in and works.

Got it, and thank you for sorting everything out. So essentially Tabor owners with a Radeon graphics card onboard won't have the option to use a second PCIe card at the same time?
Karate, Jerry. Karate. It's the lifetime pursuit of balance and harmony.