Intel's X25-V & Kingston's 30GB SSDNow V Series: Battle of the $125 SSDs
by Anand Lal Shimpi on March 19, 2010 12:00 AM EST- Posted in
- Storage
A Comparison of Spare Area
All SSDs set aside some percentage of their flash for recycling and bad block allocation. The portion set aside isn't user addressable and is often referred to as Spare Area. Most consumer MLC drives have about 7% of their total flash capacity reserved for use as spare area. Intel's X25-V is no different. The table below shows the available space vs. total NAND capacity on the drive for both the Intel and Kingston drives:
| Drive | Formatted Capacity | NAND Flash | Spare Area % |
| Intel X25-V | 37.27GB | 40.0GB | 6.8% |
| Kingston SSDNow V Series Boot Drive | 27.95GB | 32.0GB | 12.65% |
Intel's X25-V actually has the same percentage of spare area as the X25-M. It's the SSDNow V Series that is a bit perplexing. Formatted capacity for the "30GB" drive is 27.95GB. Given that NAND devices, like all memory, are made in powers of 2 there has to be 32GB of NAND on the drive. Either the Toshiba controller is using over 12% of the total NAND capacity as spare area, or there's only 30GB of usable flash on the drive. The latter could be true if the NAND devices had some existing bad blocks on them.
Either way, the X25-V basically delivers an extra 10GB at the same price point as the 30GB Kingston SSDNow V Series Boot Drive.
The Test
| CPU | Intel Core i7 965 running at 3.2GHz (Turbo & EIST Disabled) |
| Motherboard: | Intel DX58SO (Intel X58) |
| Chipset: | Intel X58 + Marvell SATA 6Gbps PCIe |
| Chipset Drivers: | Intel 9.1.1.1015 + Intel IMSM 8.9 |
| Memory: | Qimonda DDR3-1333 4 x 1GB (7-7-7-20) |
| Video Card: | eVGA GeForce GTX 285 |
| Video Drivers: | NVIDIA ForceWare 190.38 64-bit |
| Desktop Resolution: | 1920 x 1200 |
| OS: | Windows 7 x64 |
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davepermen - Friday, March 19, 2010 - link
technically, still more expensive than the intel 40gb at 125$ (per gb), but yeah, others than just kingston and intel should be listed.still i'm glad for the 33% more storage :)
buzznut - Monday, March 22, 2010 - link
Yeah, this is the decision I made when buying my 40gig. With a win7 install those 10gb make a huge difference. For an entry level SSD, I would recommend the Intel over the OCZ despite some performance differences. Especially when it comes to gaming.Choosing between the Kingston drive and Intel at the time was a no-brainer.
However I would/will look at OCZ vertex series when going to 60GB or higher capacity.
mmntech - Friday, March 19, 2010 - link
It's progress in the right direction though. Wasn't long ago when these small drives were $200-$300. Still, I'm going to wait until 80gb SSDs drop to around that price. More breathing room. Still way too small for laptop use too.vol7ron - Friday, March 19, 2010 - link
I'd like to see the 80GB/160GBs fall in price too. Once they do, I'll consume =]MadMan007 - Friday, March 19, 2010 - link
When you talk about capacities in the chart on page 4 I take it the formatted capacity is in gigabytes (GB) and not gibibytes (GiB). So on top of reserved flash there is also the GB-GiB conversion to account for?gaspard - Friday, March 19, 2010 - link
Harddrives are measured in Gigabytes (1 billion bytes), Operating systems (Windows for example) usually measure in Gibibytes... aka 1024 times 1024 times 1024 = 1,073,741,824 bytesMadMan007 - Friday, March 19, 2010 - link
Thanks bro but that didn't add or clarify anything about my question. The fact that HDs use GB and OSes use GiB was implicit background knowledge for my post. I see Jarrod made a guess but I'd still be interested to know whether the chart on page 4 for formatted capacities especially and others just for funsies is in GB or GiB.JarredWalton - Friday, March 19, 2010 - link
And flash chips are generally measured in GiB as well (or at least, the chips come in powers of 2). I think part of this is SSD makers figure they'll use the GiB vs. GB difference to make up for their spare area. So you can have 7.3% spare area and your 40GiB SSD ends up formatting to the same size as a 40GB HDD. Just a thought.GullLars - Friday, March 19, 2010 - link
This was a good test, and one i've been waiting for a while. I'm a bit disappointed a 32GB Indilinx Barefoot drive wasn't included. I have a 30GB Vertex in my laptop that performs better sequentailly than these numbers, and has better random performance than the Kingston V 30GB. The price is slightly higher though.Ref screenshot: http://www.diskusjon.no/index.php?app=core&mod...">http://www.diskusjon.no/index.php?app=c...h_rel_mo... CDM 3.0 + WEI for my laptop.
Now the next thing I hope Anandtech will do regarding SSDs is a comparison of RAID of low-capasity cheap SSDs VS single high capasity SSDs. This is something no other reckognized tech site has done yet, but enthusiasts have done for years now. Example: http://www.nextlevelhardware.com/storage/battleshi...">http://www.nextlevelhardware.com/storage/battleshi...
I'll also mention Nizzen, an enthusiast on a forum i frequent, who set a WR i PCmark vantage last spring with his 24/7 setup, and is still on top5 with the same setup (updated in august with 4GB RAM on the Areca). The key was an Areca 1680ix-12 with a RAID-0 of several (7 i think) OCZ Vertex.
ORB result page: http://service.futuremark.com/resultComparison.act...">http://service.futuremark.com/resultCom...sultId=2...
24740 PCmarks, WAY ahead of the highest score in your benchmark lists. The same level of disk performance is possible to get with an LSI 9211-8i with 8 30-40GB SSDs in RAID-0 for about $1000 (less than 2 256GB SSDs).
Suggested lineup for such an article: RAID-0 of 4 Kingston V 30GB, Intel x25-V, and Indilinx Barefoot 32GB (Vertex?). 2 RAID-0 SF-1200/1500 50GB, Kingston SSDNow V+ 64GB, Indilinx Barefoot 64GB, Intel x25-M 80GB. And single 100/128/160 GB SSDs of various controllers.
Regarding performance degrading in RAID whitout TRIM, increased reserved area can help negate the performance degrading (Ref IDF whitepaper on spare area). Increasing the spare area to ~20-25% from the default 7% (on most SSDs) will make sure degrading will not be noticable by users in normale usage models.
strikeback03 - Friday, March 19, 2010 - link
So how much faster were program loads and other useful things with that super RAID array?