HP X Class 500/550MHz hp visualize workstation - SDRAM Advantages with the HP
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- HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 1
technology VISUALIZE WORKSTATION SDRAM Advantages with the HP VISUALIZE Memory Architecture HP Workstation System Lab How lower latency leads to higher performance on demanding technical applications This paper is property of Hewlett-Packard. It may not be - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 2
application performance advantage of almost 20 percent over competing systems. The HP VISUALIZE X-Class Personal Workstation is a Windows NT system that supports 133MHz SDRAM. The competing Windows NT workstation supports 800MHz RDRAM1. This comparison focuses only on the advantages of the - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 3
an HP VISUALIZE X-Class support dual Intel processors and large amounts of memory. The SDRAM system supports eight Dual Inline Memory Modules (DIMMs) and the RDRAM system supports rate at which data and instructions can be fed to the send the data back. The Pentium III system bus has a bandwidth of - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 4
The Systems Being Compared Figure 1 shows a block diagram of the HP VISUALIZE 133MHz SDRAM memory system. The address and control lines are buffered because of the large . However, the RDRAM modules are more expensive to manufacture, which more than offsets this savings. HP VISUALIZE WORKSTATIONS 3 - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 5
are made in generating the timing diagrams in Figure 3: • As a high-end workstation, the system must support eight DIMMs or eight RIMMs. This requires the use of repeater hubs on a memory system with two adds about four 133MHz cycles (30 ns) for both memory systems. HP VISUALIZE WORKSTATIONS 4 - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 6
effects of the long latency to main memory. The Pentium III processor can have up to four outstanding requests to fill the cache. Each request is for eight 32-bit words (cache line size). The request can be generated by the need for instructions or data. The effects of long main memory latency - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 7
average burst is three cache lines (96 bytes). While in cache the average CPI (clocks per instruction) is 1.3 for this example (typical for technical applications). So on the average, the CPU executes waiting for the data (except for the first set of data). 1/5/2000 HP VISUALIZE WORKSTATIONS 6 - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 8
for the SDRAM system. • The total time is 572.5 ns for RDRAM and 530 ns for SRDRAM. • The performance difference is (572.5-530)/530*100% = 8%. HP VISUALIZE WORKSTATIONS 7 - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 9
becomes latency. And SDRAM technology has clear advantages when it comes to delivering lower latency. Ultimately, this lower latency leads to higher application performance. 1/5/2000 HP VISUALIZE WORKSTATIONS 8 - HP X Class 500/550MHz | hp visualize workstation - SDRAM Advantages with the HP - Page 10
1/5/2000 Technical information subject to change without notice. All brand and product names are trademarks of their respective companies. All rights reserved. Reproduction, adaptation, or translation without prior written permission is prohibited except as allowed under the copyright laws. ©
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This paper is property of Hewlett-Packard. It may not be copied or reprinted without the express consent of HP.
How lower latency leads
to higher performance
on demanding technical
applications
VISUALIZE WORKSTATION
SDRAM Advantages with the
HP VISUALIZE Memory Architecture
HP Workstation System Lab