You really don't know low end hardware do you? Not meant as a insult. That is brand new CPU and runs on their latest desktop socket, it's not outdated. Here's how the current Intel naming convention works for desktop CPU right now.
Their Celeron, Pentium, and i3 line all use the same exact CPU. Yes, i3s are dual cores.
Celerons are clocked the lowest and have a few instruction sets disabled that professional software would use. (keeps businesses from being cheap and building a Celeron mainframe).
Pentiums have most their instructions sets enabled and are clocked a bit higher.
i3s are clocked the highest and have hyper threading enabled on them.
Intel use to make a single core Celeron that used the same chip as the Pentium/i3 but had the extra core disabled. They stopped making that a couple gens ago though.
Atoms are Intels supper power efficient CPUs. They use entirely different architecture and are meant to be in HTCP servers, Netbooks, tablets, ect and performance reflects that as such. They make a desktop version for 90$ I think.
The reason you never really see Celeron CPUs in store is because-
People think that. As the Pentium and Celeron naming convention have been around since the 90's people think anything with that name attached to it must be old to. So low end manufactures cut corners to squeeze a i3 into their products to avoid people thinking their stuff is old.
The current gen Athlon you're referring to gets good reviews because it is just as good as what the 90$ Atom Intel is marketed at doing, but for half the price. Well I mean, close enough to it. It also makes a great cheeaappppp gaming CPU as it's the cheapest quad core you can buy. As a lot of games of a "quad core" minimum requirement to launch now even if you have a dual core that technically has enough or more juice. Everyone who I've known to use it as a gaming CPU claim it sucks for regular stuff.
Btw can you commander me a microATX case? like a normal case but smaller, and not one of those console like cases.
The Apex MJ-16 is as small is it gets for normally laid out cases. That one is extra slim as it cuts out the, normally never used, extra height above the expansion slots in favor of a smaller case. It also uses a SFX form factor PSU (that it comes with) to maintain standard case layout. Unlike my favorite compact case the Coolermaster Elite 361 which takes a regular sized PSU, but moves it internally to the front of the case to achieve having no extra height above the expansion slots. (I love supper compact cases that still use regular sized parts)
If you want a Micro ATX case the uses regular sized everything, they don't really get any smaller past a point. I mean the Antec VSK-3000, SilverStone PS08B, and FractalDesign Core 1000 all use the same basic design. Only trading a quarter of a inch here or there with one another. All three of those are well respected and well known case makers to. Could refer to them as "main brand" if you wanted to XD