Manual is available for 830 and 830L, not for 830LR; I read arounf that the "R" refers to "network adapter" version: anyone can confirm this?
830L manual says board does support up to 1GB: does it mean I can choose among 2x512 and 1x1024 options?
I also have different "flavours" for this board; are these data enough to determine board version?
62-0112-001131-00101111-040201-SiS735$M830LRRelease 01/12/2002 S
62-P190-001368-00101111-040201-SIS$K7S41190K7S41GX BIOS P1.90
62-1121-001131-00101111-040201-SiS735$M830LRRelease 11/21/2001 S
Pcchips is bottom of the barrel. If the ecs board won't run 1 gb sticks, then pcchips won't either. The max ram for the sis 735 chipset was originally designed for 1.5 gb in each pair of ram slots (you have to choose pc133 or pc2100, not both), but the board makers would have to design both slots to use 1 gb sticks, and I've never seen this before. Keep searching for reviews. Google is your friend.
Those are the specifications for the sis 735 chipset which your motherboard uses. If you want to try 1 gig ram sticks, choose a vender that will let you return them if your board won't post or only recognizes 512 meg per stick. You may have to pay a restocking fee for returns. Newegg charges 15% which is the norm.