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One long beep signals a memory failure - the stick you just bought is faulty. BTW there is no PC266 in SDRAM the maximum is PC133. PC266 is the first standard that appeared for DDRAM. so you most likely have bought something not right from the start.
Yes, according to the specs that I read the P4M800-M7 (socket 775?) is designed to support pc333.
Only one time I had a problem with an ECS motherboard, I had the correct memory, but the board had a different voltage requirement. Did not cause any issues, other than it didn't work. I don't think that this would be a problem for you though.
Some MOBO support different type of memory modules like ddr 400, 333,533 and other, if your computer is working fine with that PC400 it only means that your MOBO is compatible with it. Since you're planning to upgrade the memory just get another PC400 because the memory should be the same to work fine.
PC2100 is DDR266 memory.
PC2700 is DDR333 memory.
PC3200 is DDR400 memory
All are backward-compatible with PC2100.
Memory is designed to be backwards compatible, so generally you can safely add faster memory to a computer designed to run slower memory, but...
your system will operate at the speed of the slowest memory module or system component.
Keep in mind that the memory does need to be the same type, for example, SDRAM cannot be mixed with DDR, and DDR cannot be mixed with DDR2.
"Beta tester of "0"s and "1's"
if it works there is no problem, as the system would not boot up, but your memory will run at the slower of the two speeds, which will be PC266 and not PC333, as the faster speed ram is backward compatable because it always runs on the slowest speed.
if your motherboard is a DDR Ram supported type memory it should be able to take DDR 2100 or higher as most DDR is backward speed compatable, but it may be incompatable with certain types of ram or may need two of the same speed in each slot.
Pc 266 is the double data rate of pc133 which in DDR terms is pc 2100