[QUOTE=Kenshin;2648734]Which 25%? I have no Vertex 4/Agility 4, but have used some Vertex 2/Agility 2 and Vertex 3/Agility 3.[/QUOTE]
Vertex4 -> Linky
Agility4 -> Linky
At the 256MB size for V4 : A4 respectively,
Sequential reads: 560 : 420 MB/s
Sequential writes: 510 : 410 MB/s
Random 4K read ops: 90,000 : 48,000 /s
Random 4K write ops: 85,000 : 85,000 /s
Basically, the vertex 4 has a performance drop of about 25% sequential read, 20% sequential write, 47% for random 4K read ops - random write ops remains the same (apparently).
Also, the ECC correction performance is better on the V4 compared to the A4.
They’ve deliberately crippled the Agility 4 to make it a budget product, and possibly not to anger the Vertex 3 customers.