|All mboards have some markings printed on them that merely indicate they meet some standard. |
"SERIAL ATA II" - it supports using the second generation of SATA drives - SATA II drives - that can use a 300mb/sec burst data transfer speed. That standard is backward compatible - it also supports the orginal SATA drives that can use a max 150mb/sec burst data transfer speed.
The SATA drive controller drivers must be installed in the operating system, and the bios must be running the SATA drive controllers in a SATA mode, in order for the 150mb/sec or 300mb/sec burst speed to be possible.
If the bios is set so it's running the SATA drive controllers in an IDE compatible mode of some sort, then the fastest burst speed for them is 133mb/sec.
"ATA 133" - that standard indicates it supports IDE hard drives drives running at up to and including the max burst data speed of IDE drives - 133mb/sec. The drive must be capable of running at that burst speed too - many IDE drives 80gb or smaller have a max burst speed of 100mb/sec or slower (ATA 100, 66, or 33)
In both cases, the max data burst speed requires that hard drive has a memory cache on it's board, and that speed can only be obtained for short periods of time, in one go.
Some markings may merely be labels for what they are beside.
Your mboard, when it's in a brand name system, may or may not have an obvious model number printed on it, usually in larger characters, most often between the card slots, or near the center of the mboard.
In most cases, the company that actually made the emachines system, Trigem in Korea - did NOT make the mboard, and it was supplied to them by some major mboard maker. If the mboard is an OEM only model - made only for brand name system builders - it often has no obvious model number.
If you want to find out who actually made the mboard and what the actual model is, this excellent third party web site usually has that info:
If he has the mboard model listed for your emachines model, click on the highlighted name of it to see a page about the mboard. The manual for the mboard may be listed in the Downloads list at the left on that page, it's often the last download listed. If there is one listed, he has disabled downloading files because he doesn't want to have to pay his ISP more, but you can use the name of the manual's download file and often find that elsewhere on the web.
He would appreciate a donation.