The two cards you linked will not be flashable.
those are 9800se cards and they are slower than the 9800 non-pro.
Atlantis is only the name Sapphire calls their card.
They're all named: Sapphire Atlantis <something> (like 9800 Pro or 9800 or 9600 Pro, etc.)
what you need is this card:
http://www.ncix.com/products/index.php?sku=10043
You have no way of telling if the card has samsung memory or not. However, up until now, Saphire 9800 cards all have Samsung memory.
Note that if you get Samsung GC2A memory (2.86ns), you will not need to flash the bios in order to get pro clock speeds.
You will need to flah it only if you get GC33 memory (3.3ns), which is probably what you'll get.
The card I've linked is OEM but I ordered the exact same one from the exact same place and it came with an rca cable, a s-video cable, a DVI adapter and a s-video adapter.
If you flash the bios, the card will be recognized as a 9800 Pro. Even if you take it out yoru case and install it in another one. I suggest you save your bios but once you get the card, I'll give you more details about this, as well as the necessary files.
You will need a good psu, and the ram gets hot after the flash so I suggest you buy ramsinks.
If you want the card, I suggest you buy it now because I don't think it will last for long. There are currently 5 flavors of the 9800 gpu and one will probably be discontinued. I bet it'S the 9800 non-pro, considering what you can do with it.
FYI, the 5 cards are: 9800 128mb (the one you want), 9800SE 128mb, 9800 Pro 128mb, 9800 Pro 256mb and 9800XT 256mb.
If you want more info about the flash, go to the link I provided in one of my previous posts.