I imagine youre getting marked for spam because you keep posting the same questions over and over in random threads. And this thread with a random subject unrelated to your question probably doesnt help much
I'm not sure if youre trying to find these seoul semiconductor chips, it seems you mention pricing but then keep asking where you can buy them. Findchips.com is a good website to search for part numbers:
http://www.findchips.com/search/SDW07F1C
I'm really not that short tempered but i do have my limits. I dont have a ton of spare time and answering question upon question upon question about other peoples products doesnt do much for me when i need to be answering customers' questions. When i wake up to 8 emails to try and decipher, yes thats a bit much. I try to answer your questions here and on email when i can.
Another side of your quest to think about: I was watching the growtube roundtable tonight, and somebody asked growmau5 about orca vs panda vs mylar reflective wall coverings. His response was "well if youre one of those top shelf A+ growers like in the 95th percent and want to dial everything in to get to 98% its worth looking at things like that vs simple flat white paint. If youre an average B-grade grower like most of us there are probably a lot of other more important things you could worry about". It made me think of you, as you make post upon post upon post trying to save a couple bucks on chips and drivers, but for all that time spent you coulda had a whole rig up and running already and earning that few dollars youre saving. And who cares if they are the most efficient chip, get growing and sort it out later. Whether you buy chips from me or cutter or timber or rapid, etc, vendors dont sell crap cobs around here. if you want to go looking on ebay and alibaba and other sites to try to save a buck its on you to do the legwork in understanding the datasheet (where available) and figure out how current and efficient and suitable a chip is relative to other options. When you buy a chip from a reputable vendor you are buying that vendors expertise in selecting that model into their product line, as well as the experience of growers around here who have shown and proven results.
If the people on ebay trying to sell you chips and drivers can't or won't answer your basic application questions you have to wonder if they are worthy of your money.