OCZ has released a new series of SSDs called Synapse Cache today. This announcement is a bit different from normal SSD announcements since OCZ will be bundling Dataplex caching software with these SSDs, hence the "Cache" in the series name. As for the other specs, you are pretty much looking at yet another 2.5" SF-2281 based SSD. 

Capacities are limited to 64GB and 128GB, but there is 50% overprovision, meaning that only 32GB and 64GB will be usabe. It wouldn't make much sense to use a bigger SSD for caching though, and Intel is limiting their Smart Response Technology (our review) to 64GB as well. To briefly summarize the idea of caching; the software analyzes your usage and moves the most frequently accessed files to the SSD, while keeping the less frequently used files in the HD. Especially with smaller SSDs like 64GB, caching can be very useful because it can be hard to decide what goes to the SSD and what doesn't - now software does that for you. 

As a whole, SSD caching with OCZ Synapse might be a good option for people without Intel Z68 chipset. Which is more effective, remains to be seen though. Pricing is unfortunately unknown, so it's hard to say how attractive Synapse really is. Keeping the price close to regular SSDs is important because most people probably won't be ready to pay tons of extra for caching software. OCZ is claiming immediate availability but none of the biggest retailers have Synapse listed as of today. 

Source: OCZ