Undertale PC Hardware Guide
Official requirements explained
The official minimum requirements for Undertale ask for a GPU with 128MB of graphics memory that supports DirectX 9 or OpenGL. In today's terms that is roughly the level of an integrated graphics chip like the Intel HD Graphics 4000. The minimum CPU is not listed as a specific model, only that it must be an x64 processor with SSE2 support, which practically any PC from the last decade meets. The minimum is 2 GB of RAM and 0.2 GB of storage.
The recommended CPU is a 2GHz or faster generic x64 processor, roughly the level of an Intel Core 2 Duo E8400, an older entry-level desktop chip. The recommended GPU is a DirectX 9 or OpenGL device with 512MB of memory, which still sits around the Intel HD Graphics 4000 level. Recommended RAM rises to 3 GB, and storage stays at 0.2 GB. The publisher does not require an SSD, though none is ruled out.
For players the gap between minimum and recommended is small, mostly an extra 1 GB of RAM and a modest CPU clock bump. If your PC is an ordinary machine from the last several years, it will almost certainly sit above the recommended tier.
Recommended builds for three budgets
The entry build suits anyone who wants to spend as little as possible, or who wants to add a dedicated graphics card to an older machine. A GeForce GTX 1650 4GB or a Radeon RX 6500 XT paired with a Ryzen 3 3100 or Core i3-10100F and 16 GB of RAM is far above the official recommended tier for this game, so you can leave every option on and keep other programs open without worry.
The mainstream build is the choice most players will make. The GPU can again be a GTX 1650 or RX 6500 XT, or a GTX 1660 or RTX 3050 8GB if the budget allows. Pair it with a Ryzen 5 3600 or Core i5-10400 and 16 GB of RAM. This tier leaves room for streaming, recording, or heavier multitasking, and it is a balanced option.
The high build is about headroom for future games and for running several things at once. An RTX 4060 or RX 7600, with a Ryzen 5 5600 or Core i5-12400, and 16 GB of RAM as a starting point, moving to 32 GB if you routinely keep many applications open. For Undertale alone this tier is more than enough, so it suits people who also play demanding titles or edit video.
Graphics settings with the biggest impact
Undertale is a two-dimensional, pixel-art RPG with a light rendering load, so even on older hardware the differences between most graphics options are fairly small. If you do want to adjust settings, the usual costly items in any game are shadows, particle and visual effects, post-processing, and resolution, and those are the first places to look.
If the game offers anti-aliasing and texture quality options, keeping them at medium or higher is worthwhile, since they affect clarity much more than they affect performance. Shadows and particle effects can be lowered without changing the game's look in any meaningful way. Dropping the render resolution below native makes the image soft, so unless your GPU is genuinely struggling, stay at native resolution.
Upscaling technologies such as DLSS, FSR, and XeSS generally render at a lower internal resolution and scale the image up, trading some sharpness for extra headroom. For a game with a light load like this one, upscaling is rarely necessary, so unless your hardware is far below the recommended tier, native rendering is the simpler choice.
Laptops and handheld PCs
Laptop GPUs that share a name with desktop cards are often noticeably slower, because power limits and cooling space are tighter. A laptop GTX 1650 or RTX 3050 typically trails its desktop namesake. When shopping, check the advertised total graphics power (TGP), since higher power usually means performance closer to the desktop part. For Undertale, though, even integrated graphics on many laptops reach the recommended tier, so this matters less here.
Handheld PCs such as the Steam Deck or ROG Ally generally handle lightweight 2D games like this with ease, since the rendering load is low. We do not have Steam Deck verification data for this title, so we cannot give a specific compatibility rating, and the advice here is general only.
Whatever laptop or handheld you use, keep vents clear and play with adequate power, so that thermal throttling does not get in the way of the experience.
Storage and memory
The official storage requirement is just 0.2 GB, and even with saves and updates the footprint stays very small, so almost any drive will do. RAM requirements are 2 GB minimum and 3 GB recommended. By today's standards 16 GB is common and leaves plenty of room for the operating system and background tasks, so memory capacity is rarely a bottleneck for this game.
Dual-channel memory gives a small boost to CPU and integrated graphics performance. If your motherboard supports it, using two matching sticks is a good habit. It makes little difference to Undertale specifically but helps overall system smoothness.
An SSD is not required, but it noticeably shortens game launch and save loading times. A hard drive will still run the game, only more slowly to load. Keep some free space on whatever drive you use, both for system updates and for save backups.