Hewlett-Packard Co this week puts its 64-bit PA-8000 Precision Architecture RISC into play as a commercial Unix server engine, offering it in symmetric multiprocessing D-, K- and T-Class servers, in a development that leaves only IBM Corp among the top five commercial Unix suppliers without a 64-bit hardware option, our sister publication Unigram.X reports. However the full-blown 64-bit HP-UX 11.0 operating system doesn't ship until mid-1997 and only after that date is the use of 64-bit applications on PA-8000 expected to start picking up, The new servers are claimed to deliver twice the performance of preceding 32-bit models, the PA-7200-based D and K machines and PA-7150-based T520 line. None of these systems are being taken off the price list, although board-level upgrades to PA-8000 are available for each. At the high end HP will offer a T600 enterprise server with up to 12 180MHz processors, 4Gb memory, 30Tb disk and 112 slots. HP says system cooling issues prevent the T600 scaling to 14 CPUs as the existing T520 does. The T600 starts at $100,000 as a uniprocessor from early next year. It is also reducing prices on T520 by up to 25%. In the mid-range, HP has effectively stripped the graphics options from its first PA-8000 systems, the K-Class deskside technical engines launched back in June and re-fashioned them for commercial operations. The K260 is a 180MHz quad processor model with from 128Mb to 2Gb memory, at $61,000. The 160MHz Model 250 equivalent starts at $ 52,200. The 180MHz K460 comes with from 128Mb to 4Gb memory, and costs from $77,200. The 160MHz version costs from $68,200. The entry-level D-Class server Models D270- and D370 come with one or two 160MHz parts and from 128Mb to 1.5Gb memory with five and eight slots respectively; prices for it start at $22,260.