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Is there really 300MB/s limitation for SATA II?

post #1 of 10
Thread Starter 
I thought SATA II is limited to 300MB/s but i've seen crapload of benchmark results from SSD and HDD owners who exceed this bandwidth limitation. For example 2x Vertex2 60GB Raid-0 reaches over 500MB/s also 3x Velociraptors in RAID-0 surpasses 300MB/s limit. So where's the limitation? Someone enlighten me please.
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post #2 of 10
are you sure youre seeing 300 MB/s or 300Mb/s?

B= bytes
b=bits

8bits= 1byte
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post #3 of 10
300MB/s per port.
     
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post #4 of 10
Quote:
Originally Posted by Nautilus;12563417 
I thought SATA II is limited to 300MB/s but i've seen crapload of benchmark results from SSD and HDD owners who exceed this bandwidth limitation. For example 2x Vertex2 60GB Raid-0 reaches over 500MB/s also 3x Velociraptors in RAID-0 surpasses 300MB/s limit. So where's the limitation? Someone enlighten me please.

If you have RAID, the bandwidth doubles for each SATA drive used.
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post #5 of 10
...It is called SATA 3Gb/s.

That's gigabit, not gigabyte.... and that's just the raw throughput. With 8b/10b encoding and protocol overhead, SATA 3Gb/s provides around 280MB/s usable.

Each port provides a dedicated point-to-pont connection.
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post #6 of 10
RAID is ALWAYS >1 cable/drive
2 cables/drives = 2x 300MB/s
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post #7 of 10
Quote:
Originally Posted by c00lkatz;12563435 
300MB/s per port.

This.

Folks fail to recognize that if you're running two 3 Gb/s drives, then you have 6 Gb/s bandwidth available.
    
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post #8 of 10
Thread Starter 
OK 280MB/s per port. Thank you everyone. SATA 6gbps is sooo useless to me now.
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post #9 of 10
Quote:
Originally Posted by Nautilus;12563477 
OK 280MB/s per port. Thank you everyone. SATA 6gbps is sooo useless to me now.
It will become less useless as SSD's get faster and faster, but yes, for today's mechanical HDD's and many SSD's, it is quite useless.
     
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post #10 of 10
Thanks for this thread. Really helped with my buying decision!
    
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