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Quick Answer
Mixing RAM brands can work but is not recommended. Different brands may have different timings, voltages, and chip manufacturers, causing instability or forcing all sticks to run at the slowest speed. For best results, buy a matched kit from one manufacturer.
When you install RAM sticks with different specifications, the motherboard automatically downclocks all sticks to the slowest common speed and loosest timings. This means your fast kit becomes slower to match the slow kit.
Always buy a matched kit (2x16GB or 2x8GB from one package). RAM kits are tested together at the factory to ensure compatibility and rated speeds. Individual sticks are not tested as pairs.
Our Verdict
Buy a matched RAM kit, do not mix brands. The small savings from reusing old RAM is not worth potential instability and guaranteed performance loss. A new 32GB DDR5 kit costs as little as $140 AUD.
32GB is the new standard for gaming in 2026. Several modern titles use 14-16GB of RAM, leaving 16GB systems with no headroom for background tasks. The price gap is only $30-50 AUD for DDR4 and $40-60 AUD for DDR5, making 32GB the clear choice.
The best RAM for the Ryzen 7 7800X3D is 32GB DDR5-6000 CL30 in a 2x16GB kit. DDR5-6000 hits the AM5 sweet spot where the Infinity Fabric runs at a 1:1 ratio with the memory clock, giving optimal latency and bandwidth for gaming.
DDR4-3200 and DDR5-5600 perform within 3-5% of each other in gaming with the i5-13400F. The DDR4 platform costs $80-120 AUD less overall. DDR5 only shows meaningful gains with very fast kits (6000+ MHz) that are expensive. DDR4 is the value choice.