Solved Crucial M4 SSD write speeds sub par Tags: SSD Clean Install Crucial Benchmark Storage Last response: October 29, 2011 7:28 PM in Storage Share rcfant89 October 29, 2011 10:29:33 AM I have a Crucial M4 ssd with the latest firmware 0009 installed. Clean install of win 7 pro 64 bit, AHCI turned on and I run a benchmark. The thing is fast as lightning to load programs and read stuff with the sequential read speeds over 500 mb/s but the write speeds seem to be well below what other M4 users are getting. Using the "AS SSD" benchmark, my speeds are the following: Read: Seq: 513.18 MB/s 4K: 23.07 MB/s 4K-64Thrd: 243.58 MB/s Acc.time: 0.103 ms Score: 318 Write: Seq: 97.28 MB/s 4K: 47.13 MB/s 4K-64Thrd: 86.93 MB/s Acc.time: 0.274 ms Score: 144 Overall score is 611. MSAHCI - OK 103424 K - OK (<and what does that mean?) Thanks and let me know. More about : crucial ssd write speeds par nikorr a b G Storage October 29, 2011 11:45:43 AM It looks fine for the 64GB model. Best solution RetiredChief a c 351 G Storage October 29, 2011 3:29:55 PM Share You are using the default msahci driver, recommend downloading the latst intel RST driver Ver 10.6. That should change the driver to iaSTor. Link for RST driver (Should be on Intel's sata III Port: http://downloadcenter.intel.com/SearchResult.aspx?lang=... The 2nd OK is for partition alignment. Side Note: Do NOT want to run the benchmark program to often, will start showing poor benchmarks. Trim and Carbage collection take time on the M4. Screen shot of My M4 (With Firmware 0009) using AS SSD. It's the 128 gig, so 64 gig should be a little slower. Related resources OWC vs Vertex 3 vs Vertex 3 High IOPS vs Crucial M4 - Forum Crucial M4 sata ii ssd slow write speeds AHCI enabled - Forum Crucial M4 vs OCZ Vector 128gb - Forum OCZ Vertex 4 vs Crucial M4 - Forum The 3-way foot race: Vertex3 / Intel 510 / Crucial M4 - Forum Can't find your answer ? Ask ! Get the answer Dereck47 a c 503 G Storage October 29, 2011 4:14:12 PM Verify that your drive is connected to port SATA3_0 or SATA3_1, not GSATA3_5 or GSATA3_6. MSAHCI is Microsoft's default AHCI driver. Use Intel's latest RST driver. rcfant89 October 29, 2011 6:42:50 PM Best answer selected by rcfant89. rcfant89 October 29, 2011 6:44:17 PM Thanks, I downloaded the intel driver and my performance went up a bit but, it was mainly a read speed increase. My write speeds are very similar to yours but my write speeds (seq and 4k-64Thrd) are less than half yours. Sure a larger SSD might be a little faster but no way it's twice as fast to write, no? RetiredChief a c 351 G Storage October 29, 2011 7:22:55 PM Part of this could be that you have recently run the benchmark. The benchmark, for comparision, should be done on a Clean SSD shorly after installing OS. Repeated Runs will show lower performance. One consolation, Sequencial read/write performance is the least important followed by the 4K-64 Values (very few uses use more than 3 -> 5, so 64 is not a realistic value). Reads are generally more important than writes also for Loading the operating system and loading a program. With a 60/64 Gig SSds alot of the "writes" are set to the HDD any ways. It's a shame that most reviews limit the review to the larger SSDs often the 240/256 Gig drives and some for the 120/128 gig drives, but very few post the AS SSD scores for the Sub 120 gig SSDs. Dereck47 a c 503 G Storage October 29, 2011 7:26:18 PM RetiredChief said:It's a shame that most reviews limit the review to the larger SSDs often the 240/256 Gig drives and some for the 120/128 gig drives, but very few post the AS SSD scores for the Sub 120 gig SSDs. Probably for marketing purposes. Manufacturers submit their best drives for high reviews. RetiredChief a c 351 G Storage October 29, 2011 7:28:19 PM You are correct. That is also why they generally post Sequencial read/write performa using Compressable data. Can't find your answer ? Ask ! Publish Related resources CRUCIAL M4 OR INTEL 520? READ/ WRITE ?? Forum Crucial M4 - Getting 3GB/s speeds instead of 6GB/s speeds ? Forum 128GB Crucial M4 SSD (Poor Benchmark) Forum Crucial M4 128GB SSD - master boot record frequently becoming corrupt Forum Crucial M4 vs. Samsung 840 Pro or OCZ Vector Forum My computer is saying that there is a hard disk failure Forum SSD stability? Forum SSD as boot drive, partioned 40 as disk cache? Forum Raid 0 SSD setup for amateur Forum 160 GB SSD for general use Forum OCZ SSD on new built system Forum [Solved] Confusion over SSD Forum SSD Caching (Smart Response Tech) vs. standard SSD setup Forum [Solved] Kinsgton Hyper X 240GB SSD Storage with Kingston Hyper X 120gb SSD for OS/Progam Forum Ssd and raid - 0 together? Forum More resources Read discussions in other Storage categories Hard Drives DVD Drives DVD Writers Optical Media Flash Media NAS/RAID SSD Western Digital !