# PCI-X Connectivity - The Tiger K8WE does not have an onboard AMD PCI-X controller chip, which means it cannot support any 64-bit PCI-X devices, whereas the Thunder K8WE board can support several. This limits the Tiger K8WE's expansion slots to PCI Express and 32-bit PCI. While no PCI-X connectivity would be considered a major hindrance for the workstation/server markets in the past, since this board has a secondary PCI Express expansion slot, this somewhat makes up for the lack of PCI-X support. While quantities are slim, there are PCIe RAID and GigE cards on the market now which are on par with high-end PCI-X cards.
# Dual LAN Support - The "standard" Tiger K8WE only has one Gigabit Ethernet port, whereas the Thunder K8WE comes with dual GigE ports standard. For most users, one GigE port should suffice, but those who need two GigE ports can always purchase the "server" variant of the Tiger K8WE.
# "True" 16x16 SLI Support - The Tiger K8WE only has one nVidia nForce4 Professional (2200) chip onboard, which limits the amount of PCI Express lanes this board can utilize to 20. The Thunder K8WE, on the other hand, has two nForce4 Professional chips (2200 + 2050) onboard, which allows it 40 lanes to utilize, which allows the more expensive Thunder K8WE to have "true" PCI Express 16x16 SLI. The Tiger K8WE, on the other hand, must use PCI Express 16x4 for SLI configurations, which can hurt performance.
# Passive Chipset Cooling - One of the nicest attributes about the huge Thunder K8WE is that the motherboard has passive cooling on all of its chips, which is important for the workstation markets who demand low noise systems. The Tiger K8WE, on the other hand, is forced to use a small active chipset cooler on its nForce4 Pro chip due to its smaller size. The nForce4 Pro chip sits underneath the PCI Express graphics card slots, so there is no room for large heatsinks in this high-heat area. The chipset cooler isn't too loud, but was certainly audible throughout our testing. Other standard ATX-sized dual-Opteron boards from MSI and Asus have also had to make the same compromise.
# Support For Oversized CPU Coolers - The Extended ATX layout of the Thunder K8WE also provides ample room for large CPU coolers, allowing users to pick up large heatsinks with low-noise fans. Again, the smaller size of the Tiger K8WE makes this impossible. While the majority of AMD Socket-939/940 coolers will work on this motherboard (since it uses AMD's standard heatsink retention system), coolers which extend past the mounting area, like the Zalman CNPS7700-series, will not fit on this motherboard.
hyeah: 
