Sun Ultra Workstation Comparison Chart

Differences between Sun Ultra 20 and Ultra 40 Workstations:

Feature	Sun Ultra 20 Workstation	Sun Ultra 40 Workstation
Max no. of CPUs	Single Processor, Single or Dual-Core Configurations	Dual Processors, Single or Dual-Core Configurations
CPUs supported (AMD Opteron)	Opteron 100 series	Opteron 200 series
Memory (RAM)	Up to 4 DIMM slots, unbuffered DIMMs only PC3200 ECC (1 GB, 512 MB) or non-ECC (256 MB) capacities. Up to 4 GB.	Up to 8 registered DIMMs (4 per CPU), DDR1, 400 ECC in 512 MB, 1 GB and 2 GB capacities. Up to 16GB.
Disk Storage	Up to 2 SATA hard drives, Ultra 320 SCSI support via X-Option	Up to 4 SATA hard drives (1 TB max) in 80 GB, 250 GB and 500 GB capacities
Optical Media	Either DVD-ROM or DVD+R/RW	Dual Layer DVD-RW
Graphics (AGP8x)	NVIDIA Quadro NVS280, FX540, FX1400, FX3450	NVIDIA Quadro NVS285, FX540, FX1400, FX3450, FX4500
Chipset	NVIDIA nForce®4	NVIDIA nForce® Professional 2200 NVIDIA nForce® Professional 2050
Form Factor	Tower	Tower
PCI Slots (64-bit)	1 PCI Express x16 slot, 2 PCI Express x1 slots, 4 conventional PCI slots (32-bit, 33 Mhz)	2 PCI Express x16 graphics slots, two PCI Express x4 expansion slots, two conventional PCI 33 Mhz, 32-bit slots
Operating Systems Certified	Solaris 10 (pre-loaded), Linux (Red Hat Enterprise Linux 3.0 WS Update 6 32-bit and 64-bit, Red Hat Enterprise Linux 4.0 WS Update 2 32-bit and 64-bit, SUSE Linux Enterprise Server 9 w/SP3 32-bit and 64-bit), Windows (XP Professional, Windows XP Professional x64 Edition)	Solaris 10 (pre-loaded), Linux (Red Hat Enterprise Linux 3.0 WS Update 6 32-bit and 64-bit, Red Hat Enterprise Linux 4.0 WS Update 2 32-bit and 64-bit, SUSE Linux Enterprise Server 9 w/SP3 32-bit and 64-bit), Windows (XP Professional, Windows XP Professional x64 Edition)