Tom's Hardware > Forum > Motherboards & Memory > General Motherboard > Why will proposed 2 PCIE x16 M/B's share one x16ch

Why will proposed 2 PCIE x16 M/B's share one x16ch

Forum Motherboards & Memory : General Motherboard - Why will proposed 2 PCIE x16 M/B's share one x16ch

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geoff   08-21-2004 at 09:03:20 AM

I have only read about one board by Via to offer dual PCI express x16 slots. However they said they will share one x16 channel. What are the reasons for this? And will it compromise an SLI configuration?

Geoff.

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icey0   08-21-2004 at 10:12:05 AM
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What board is this and do you know when it is expected to be released?

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geoff   08-21-2004 at 11:13:53 AM
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It was mentioned on THG news site.
http://www.tomshardware.com/hardne [...] 74414.html

No release date. Just talk of the developement of it.


Geoff.

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Crashman   08-22-2004 at 03:08:38 AM
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I think the PCI-Express controller only has 32 data streams, hence they have to do some sharing to have two X16 slots allong with several x1 slots.

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geoff   08-22-2004 at 08:20:28 AM
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I have found some updated info. On Anandtech, I spied an article about Nvidia's chipset for M/B's which will support dual PCIe x16 slots. It will also share one x16 channel between two x16 slots, as with the VIA solution. But they explain that current generation cards do not require the full x16 channels. AGP8 has a theoretical throughput of 2.1GBps half Duplex. But a PCIe x16 slot with only x8 channels has a maximum theoretical throughput of 2GBps Full duplex. So my original concerns seem unnecessary.

So roll on guys and finish your boards. I have found my new system.

Geoff.

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