I've seen a ton of videos on Youtube where people attempt to build a PC for games like CS:GO and League of Legends for under $100. Some of those builds are decent,but some are complete junk. I saw one build where the guy used a single core AMD Sempron CPU.
I decided to try my hand at the $100 build challenge and this is what I got...
I purchased a Dell Optiplex 380 from a seller on Craigslist. The PC was $25 and only came with a Core 2 Duo e7500,a 250gb Seagate HDD. The seller originally wanted $40,but I told him I did not need the 4gb of RAM the PC came with and I'd give him $25 for the PC sans memory. He agreed.
The reason I did not want the RAM is because I had 8gb of DDR3 purchased already. The RAM was purchased used off ebay for $20.
The first thing I did was install Windows 7 using the key on the CoA sticker,afterwards I upgraded to Windows 10.
The C2D CPU was somewhat lacking in speed,so I decided to upgrade the CPU. Since this Dell has a motherboard that can be modded to use 771 Xeons,I did just that. I upgraded to a Xeon e5450 which is a ton better than most Core 2 Quad chips. And the e5440 only cost me $9 on ebay. I also had to purchase a sticker for $1 to complete the mod.
If you are interested in the mod,google " 775 to 771 motherboard mod" for more info.
My choices for a GPU were limited by power supply and room in the case. The huge fan enclosure only allows for cards that are less than 7 inches,and they must be single slot only. I decided to go for a Dell OEM version of AMD's R7-250 2gb card. I picked it up off ebay for $28.
I also threw in a 2nd 250gb Seagate HDD that I had laying around. I'll value that drive $10 since that is what they seem to go for used minus shipping on ebay.
Dell Optiplex 380 PC - $25
8gb DDR3 RAM -$20
Xeon e5440 + sticker - $10
AMD R7-250 -$28
Seagate 250gb HDD - $10
Added up,I ended up spending $93.
I have tested a few games so far,I was able to get about 70FPS on CS:GO playing at high at 1080p. I can play a lot of newer games at medium on 720p and get around 40FPS. I've yet to test LoL on this PC yet.
All in all,I'd say for $93,I did alright. I might pick up a DP to HDMI adapter since the card only has DVI and DP.
If you have any questions,please ask in the comments.