|OCZ Vertex SSD RAID-0 Performance|
|Reviews - Featured Reviews: Storage|
|Written by Olin Coles|
|Friday, 03 April 2009|
Page 10 of 14
HD Tach RW Benchmark Results
EDITORS NOTE 05/10/2009: Benchmark Reviews has re-tested the OCZ Vertex with the latest v1.10 firmware, which includes TRIM support, and the resulting performance was generally identical to the previous firmware. Please remember that TRIM is a Windows 7 supported feature, and does not improve performance on Windows XP or Vista Operating Systesm.
Although HD Tach (and also HD Tune or Crystal Disk Benchmark) are all excellent tools for measuring Hard Disk Drive products, they fail to offer the same precision with Solid State Drive products. These programs offer only an approximate estimate of bandwidth speed through their quick-result sample-testing mechanisms, as I have proven in the Solid State Drive (SSD) Benchmark Performance Testing article published not long ago. Nevertheless, HD Tach is still useful for offering an alternative perspective at performance, even if it isn't precisely correct when used with SSD architecture.
HD Tach is a software program for Microsoft Windows that tests the sequential read, random access and interface burst speeds of the attached storage device. For the record. every single product tested was brand new and never used. HD Tach allows write-bandwidth tests only if no partition is present. Additionally, each and every product was tested five times with the highest and lowest results removed before having the average result displayed here. The graphical user interface (GUI) of the Windows-based benchmark tool HD Tach is very convenient. and allows the test product to be compared against others collected on your system or those registered into the Simpli Software database.
In the tests below, Benchmark Reviews utilizes the HD TachRW tool to compare the fastest collection of desktop drives and competing SSD's we can get our hands on. Using the Intel ICH10R SATA controller on the Gigabyte GA-EX58-UD4P, HD Tach was used to benchmark the test SSD five times with the best results displayed below. It's important to note that HD Tach's Burst Speed result should be ignored for Solid State Drives due to the cache methods inherent to each memory controller architecture. There are times where this number will be extremely high, which is a result of the optimized cache used for SSD's.
The important numbers used for comparison are the sustained read and write bandwidth speeds, which indicate an approximate performance level of the product. Our featured test item, the OCZ Vertex 120GB SATA SSD OCZSSD2-1VTX120G, performed at an average 236.6 MBps best sustained read speed and a best of 162.6 MBps sustained write bandwidth.
Looking at the peak maximum's charted in these illustrations, the OCZ Vertex had a very consistent read speed nearing 240 MBps while the write-to performance occasionally reached 225 MBps. Unfortunately though, HD Tach doesn't offer very consistent test results for the write-to performance on the Vertex SSD.
Compared against the stated specification of 200/160, our read results appear way beyond the conservative range OCZ set, but the write performance falls a little short of the advertised maximum speed. Keep in mind that HD Tach is only capable of offering approximate estimates for SSD products, as evidenced by the three very different write-to performances for the Vertex tests taken only minutes apart. The range of 131.3 to 162.6 MBps is a little wider than I would like for a test tool, but I've already warned that HD Tach is meant for Hard Drive products, hence the name. Now let's see how badly HD Tach reacts to a RAID-0 set of Vertex SSDs:
I've said it before, and I'm about to say it again: HD Tach is not a reliable tool for testing SSD performance. Taking a look at the single-Vertex versus RAID-0 Vertex SSD performance, you can see exactly what I mean. Judging from the HD Tach results, you might think that read-from performance in RAID-0 is worse than a single SSD, but it's not. I'll agree that the write-to bandwidth is better real world applications, just as it is in HD Tach, but otherwise the software isn't accurate and should be disregarded.
The chart below illustrates the collected averages for benchmark results using HD Tach RW on the Intel ICH10 SATA controller, with the read and write bandwidth results added together to determine rank placement. The first group is a collection of high-performance storage products. Positioned in first place and well above the RAID-0 performance a set of Western Digital VelociRaptor hard drives can offer, the OCZ Vertex outperforms every single storage drive product by a significant margin.
The OCZ Apex and Intel X25-M SSD both trail behind in overall performance and finish out the top four positions. Nearly every other storage product trails distantly behind these leaders, which all recorded a combined HD Tach bandwidth to over 300 MBps for each.
A single (non RAID-0) VelociRaptor and Seagate 7200.11 hard drive begin the next segment of upper midrange performers, offering nearly 200 MBps of combined bandwidth. Trailed by a closely-packed group consisting of the Patriot Warp v2 SSD, Silicon Power SP032GBSSD750S25, and G.Skill FM-25S2S-64GB, are SSDs generating between 168-172 MBps of combined average bandwidth.
The lower-midrange SSD products begin with the Western Digital Raptor, scoring a combined total bandwidth of 154 MBps delivering half the performance of the leaders. Yesterday's high-performance SSD is today's low-performance drive, and the Mtron MOBI 3500, OCZ OCZSSD2-1S32G SSD, Super Talent MasterDrive MX SSD and Mtron MOBI 3000 all comprise products with less combined performance than Hard Disk Drive alternatives (except in regard to response time).
In our next section, the entire collection of SSD products Benchmark Reviews has tested will be timed for a Windows XP startup benchmark. Please continue to see how SSD's effect startup performance.