Update: We contacted SoyoUSA regarding the problem with memory that we had, here's the response we got:
I have tested some 512MB modules made my PDP, these module are Non-ECC, unregistered and Unbuffered. according to PDP, they have tried several different brand of memory, registered and unregistered. but only Non-ECC, unregistered, unbuffered memories will work with this board. for XP support, please try our latest BIOS posted on the website. for Dragon Plus the latest bios is 2BA1.
Via's KT266 chipset was a breakthrough in the industry by allowing DDR memory to be bundled with Athlon processors at a low cost to the consumer. Although the KT266 was a relatively stable and good-performing chipset, it lagged behind the likes of the AMD 761 and the SiS 735 (both of which outperformed the Via KT266) chipset in memory performance. This issue was pretty big with end-users and Via took some flak about it's performance pitfalls in its memory controller. The result of this is that Via released the KT266A, which features a new North Bridge (VT8366A) that addresses the issue of the KT266 (VT8366) by adding a new memory buffer along with deeper internal buffers.
Soyo is a company that has remained in the shadow of the likes of Asus and MSI in the motherboard game. While occasionally they pop up with a great product, they usually stay behind the bigger players: releasing products after them and not really marketing as much as them. But Soyo is a respected and talented maker of mainboards as we will soon find out and their boards feature some of the best bang for the buck. Soyo is a company that is still trying to recover from the release of the K7ADA which didn't fair well at all because of the low-performing ALi chipset. With the release of the KT133A chipset, Soyo put out the K7VTA Pro mainboard which was both a great performer and a great overclocker. As a follow up, they released the K7V DRAGON motherboard based on the KT266 chipset. The motherboard was a fairly good success with shortages at first. From the group consensus, the DRAGON was a great motherboard with all of the features that one will need AND want. The onboard RAID, 6-channel audio, and Ethernet meant more open PCI slots and greater compatibility. For all of you who are wondering what DRAGON stood for:
RAID controller on board
Audio on board, with 6-chanel Hardware Audio
Graphic, Universal AGP Pro slot
Overclocking, setup FSB by 1MHz increment
Network, 10/100 Mbps Ethernet
The DRAGON original was a great board with no major issues to date (except low overclocking performance) and all of the latest features such as an AGP Pro slot to protect from obsoleteness. Also, it came in a fashionable black/dark red color scheme. Just a couple of months ago, Soyo announced the production of the K7V Dragon Plus motherboard, the successor of the KT266 based K7V Dragon. The Dragon Plus was based on the new KT266A chipset and promised better performance and stability. You could say that the Dragon Plus is basically a Dragon with a new North Bridge and compatibility for the new Athlon XP processors. The sentiment here is: if it works well, don't change it.