IBM i series Handbook page 241

Model 820 Upgrades
To 2436
From
1521
1522
1523
1524
1525
1526
1521 B B B B
1522 B B B B
1523 B B B
1524 B B
1521 B B B B
1522 B B B
1523 B B
1524 B
1525
1521
1522
1523
1524
1525
1526
1521
1522
1523
1524
1525
1526
Model 820
2437
B B
B
B B B B B B
B B B B B
B B B B
B B B
B B B B B B
B B B B B
B B B B
B B B
B B
B B B B B
B B B B
B B B
B B
B
B
Upgrades to iSeries 8xx Servers
2438 2457 2458
B B
B B B
B B B B
B B B B
B B B
B B
B B
B B
B
B B
B B B
B B B B
B B B B
B B
B B B
B B B B
B B B B
B B B
B B
B B B
B B B B
B B B B
B B B
B B
B B
B B B
B B B
B B B
B B
B
B B
B
Upgrades to iSeries 8xx Servers
211