I have a SE7525RP2 with two Xeons since new, still in use.
The boxed cpu’s came with a hefty copper heat sink and fan each. The bracket they screw into gets attached to the motherboard tray, the case has different screw holes for it and you move it to the right spot so that it aligns. The coolers do not attach to the motherboard.
Mine is in an Antec Titan server case.
The E7525 north bridge supports DDR2-400 registered ECC memory. Latest cpu’s supported is the Irwindale 2MB Prescott / Hyperthreading based Xeons. It does not support dual core socket 604 cpu’s. Highest clock 3.8GHz. Mine is running 2x3GHz.
The 6300ESB south bridge supports ATA100 and non-native SATA150 (SATA in IDE mode, no NCQ)
A silicon image 3124 PCI-X card is a nice storage addon.
I see yours also has the 8MB Rage XL PCI on board. Good for text console only, video quality is a “knife through the eyes” experience 😀
Onboard LAN is a single lane pci express Marvell 8050 gigabit chipset in my case, quite a good performer. Runs wire speed on gigabit without breaking a sweat at all. Looks like yours has a dual lan option, those came with a marvell and an intel chipset, looks like yours has the e1000 intel populated. That one is connected to pci or pci-x if Im not mistaken.
The weak point of the E7525/6300ESB combo is the link between the north and south bridges only runs at 266 megabytes per second. Sata, ide, pci and pci-x buses sprout from the 6300ESB, where the E7525 has the cpu bus, memory controller and pci express (1.0) controllers built in. If you want fast and unbottlenecked IO you have to use pci express. (and keep the 266MB/s limit in mind of everything on the south bridge, so that you put stuff there that will not exceed that)