GTA Trilogy system requirements are here

You would think that a remastered game wouldn't be that demanding on your system and there might be no need to upgrade the system either.

For most people that might be correct but GTA Trilogy games have come a long way since they were first launched at that time and actually are a little bit more demanding for the current gaming hardware. At that time you would simply need a Geforce 3 or GeForce 6 with a 256MB to 384MB RAM to run the games on your machine. But now you need at least GeForce GTX 760 or a Radeon R9 280, with a GTX 970 or RX 570.

Grand Theft Auto: The Trilogy – Definitive Edition minimum system requirements

• OS: Windows 10 64-bit
• Processor: Intel Core i5-6600K / AMD FX-6300
• Memory: 8GB
• Graphics: Nvidia GeForce GTX 760 2GB / AMD Radeon R9 280 3GB
• Disk: 45GB

Grand Theft Auto: The Trilogy – Definitive Edition recommended system requirements

• OS: Windows 10 64-bit
• Processor: Intel Core i7-2700K / AMD Ryzen 5 2600
• Memory: 16GB
• Graphics: Nvidia GeForce GTX 970 4GB / AMD Radeon RX 570 4GB
• Disk: 45GB