Question Fastest bootable storage possible for a system with PCIe 1.0

Anston06

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Apr 21, 2020
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I have a system from around 2007 with a Radeon Xpress 200 chipset. I want to find out what the fastest storage is that it can use. It has PCIe 1.0 and SATA II. Currently, I have a SATA III SSD in it, but the slot is limited to 300 MB/s instead of 600 MB/s which the SSD is capable of. According to Wikipedia, if the full PCIe slot is used, it can achieve a throughput of 4 GB/s. I looked into M.2 to PCIe cards, but the motherboard is way too old to support that unless BIOS mods could be done (which sounds like a bad idea).

Then, I came up with the idea of using a SATA PCIe RAID card. If I could find a RAID card that uses the full slot (x16), I'm sure I could achieve something higher than 300 MB/s. The problem is that most of these cards only use part of the slot. I see a few cards that either use x8 or x16. Most of them are HighPoint RAID cards.

Is a faster solution than what I currently have even possible? What solution would I use? If I were to use PCIe, would it be bootable? Could I get a card with some kind of boot controller that would allow it to boot with legacy BIOS?
 
If you truly have SATA II and see 300MB/s then you have one of the very last Radeon Xpress 200 chipsets which was paired up with the M1575 Southbridge from ALi corporation. All other Xpress 200 southbridges were limited to SATA I and 150MB/s per port

M1575 allows four SATA II drives in RAID 0 which would allow up to 1GB/s. Why only 1GB/s? Because the Southbridge is attached to the Xpress 200 Northbridge via a x4 PCIe 1.0a link which would be the bottleneck:
1575diagram.jpg

In practice, I'm not sure if a 3-drive RAID 0 would test any slower even though it's theoretically only 900MB/s