At the beginning of the month, ATi launched their X300 with HyperMemory. HyperMemory is essentially ATi's answer to TurboCache, using system memory for graphics processing thanks to the PCIe interface.
However, early reports suggest that the X300 with HyperMemory isn't fast enough to take on NVIDIA's GeForce 6200 TurboCache. A 32MB X300HM is trumped by a 32MB 6200TC in most benchmarks. In fact, even the 128MB X300HM doesn't seem to be able to keep up with its 32MB 6200TC counterpart.
Find a set of benchmark results over at HKEPC hardware.