Kami said:
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Faster RAM only increases the bandwith, and without an iGPU this effect is basically lost. So you don't need faster RAM.
In any case, trying to upgrade an OEM PC is a pain in the backside, which is why they are generally avoided like the devil by PC gamers. Their Mainboards often lack features (or locks them away), their PSU tend to be shitty at best, cooling is low-price, loud and ineffective, and often the cases themseves are all of the above. To top it off they also often come with a metric crapton of useless additions such as Software you'll never ever need in your entire life and outdated connecters added for those offices which tend to upgrade their PCs once every century or so (Case of point: My mom bought a PC 3 years ago and it still had an LPT1, COM, and PS/2 connectors, which are not supported by the preinstalled Windows 8 anymore, but lacked any support for USB 3.0 or SATA3). Finally, they are often overpriced for what they are: Gloryfied office PCs with an added Graphics card.