Compaq DIGITAL Server Cluster Kits for Windows NT Configuration Manual page 53

If you plan to use an existing server, check the following tables to make sure that it is supported.
Pair any existing server with a new server capable of handling the workload of both servers. It is
recommended that both servers provide the same basic performance capabilities (for example,
purchase a second 5100 to pair with an existing 5100). Two identical servers provide for optimal
performance in the event of failover, although Compaq will support non-identical Alpha-based or
Intel-based DIGITAL Servers (mixed server architecture clusters are not supported). Make sure
that each server has sufficient internal storage for operating system, cluster and application
software.
Intel-based Servers:
DIGITAL CPU version
Server
1xxx series 590
5100, 5100DP
5133, 5133DP
5166, 5166DP
5200, 5200DP
6200
31xx series 6200, 6200MP/2
32xx series
33xx series
51xx & 52xx 590, 590MP/2
series
5133, 5133MP/2
5166, 5166MP/2
6200, 6200MP/2
53xx series
7000 series 5133MP, MP/2, MP4
5166MP, MP/2, MP/4
6166MP, MP/2, MP/4
6200MP, MP/2, MP4
73xx series
Min. BIOS rev. Min. SCU Rev.
2.06 1.10e
2.06 1.10e
2.06 1.10e
2.06 1.10e
2.06 1.10e
1.02 1.03
2.06 1.10e
1.10 1.01.01
1.10 AlphaBIOS V5.64
1.10 1.08e
1.10 1.08e
1.10 1.08e
1.00 N/A
1.10 AlphaBIOS V5.65
1.00.07 BGO 3.30
1.00.07 BGO 3.30
1.03 1.03
1.03 1.03
1.10 AlphaBIOS V5.65