Treat this as a diagnosis, not a shopping trip. Below is an ordered, South African gaming checklist for the symptom in the heading, written so each step is something you can verify yourself before booking a repair or buying a replacement.

Quick Answer

Treat this as a diagnosis, not a shopping trip. This usually comes down to heat, an unstable EXPO profile or background load rather than a faulty RTX 5070. Run a fixed 20-minute test after each change and keep the one that holds at a steady frame rate or a stable temperature under 85C.

Heat and airflow checks

Confirm the case has a clear front-to-back path and that no cable is resting against a 120mm or 140mm fan. Log temperatures across a 20-minute session; a CPU sitting at 95C or a VRM past 100C points to airflow or paste, not the silicon.

Memory stability checks

Re-test with the EXPO or XMP profile off; an unstable 6000MT/s kit can throw stutters and crashes that look like a board fault. Re-test with the EXPO or XMP profile off; an unstable 6000MT/s kit can throw stutters and crashes that look like a board fault.

Driver and BIOS hygiene

Roll the GPU driver back to the last stable release, then do a clean reinstall using DDU so leftover files do not clash. Update the chipset package straight from the AMD or Intel site rather than trusting Windows Update to pick the right version.

Plan a baseline budget of around R13,000 before you start.

FAQ

How long should each test run?

Use a fixed 20-minute load that reliably triggers the fault. A shorter burst can hide a thermal or memory problem that only appears once the system is fully warmed up at 80C or higher.

Should I reset my overclock or EXPO profile?

Yes, as a test. Turn off EXPO and any GPU overclock, run the same load, and see if the fault disappears, since an unstable 6000MT/s kit is a common hidden cause.

Is the RTX 5070 actually the problem?

Not until the software, heat, power and cable checks all pass. The RTX 5070 is the platform under review, so rule out the cheaper causes first and only suspect the hardware once a clean reinstall and a default-BIOS test still fail.

Replace only what the evidence shows If the checks isolate the fault, compare current GeForce RTX 5070 cards on Evetech and upgrade the one part that proved unreliable.