The first engineering sample of a core i7-810 emerged in China. The 2.13 GHz Lynnfield processor might probably be intended for the Chinese market only.
Intel Core i7 810 (2.13 GHz Lynnfield) sighted in China
A Chinese website was able to get a Core i7-810. The engineering sample is based on the Lynnfield CPU and has apparently been developed for the Chinese market.
The CPU-Z shot reveals several details. According to the tool the Core i7-810 is running at 2.13 GHz and offers SMT. Thus the four physical cores are accompanied by four virtual cores. Due to the Lynnfield base the CPU fits into the socket 1156, was produced in a 45 nanometer process and has 8 MiByte L3 cache.
The first benchmarks have been made, too, and the core i7-810 had to show its capabilities in SuperPI and Cinebench R10. The used test system was based on a MSI P55 GD65 motherboard with 2 GiByte DDR3-1333 RAM and a Geforce GT 240. The operating system of choice was the 64 Bit edition of Windows 7 Ultimate. In SuperPI the Core i7-810 needs 19.160 seconds to finish the benchmark. In Cinebench R10 the processor reached 12,466 (multi-core) respectively 3,022 (single-core) and 4,412 (OpenGL) points.
It could be that Intel chooses this way to sell processors that don't reach 2.8 GHz which would be the minimal requirement for a Core i7-860 or i7-870.