The TK-53 is a bit of a mystery. It's specs classify it as a mobile processor, but it's being marketed as an Athlon X2. It seems to be only available to OEM builders.
If I had to assign it an Athlon X2 P.R., I would say it's about an X2 3400+, possibly 3300+ since it has higher latency 2x256K L2 cache (brisbanes and tylers). When in power saver mode (which is what I'm running at 90% of the time), it should throttle down to 800MHz like all X2 AMD notebooks with 800MHz HT, and there shouldn't be that noticeable of a difference in performance.
I'm typing on a DV6000Z with a Trinidad TL-56 right now.