I'm comparing 32GB DDR5-6000 memory kits with the same specifications except for latency: CL30, CL32, CL34, and CL36. The CL30 kit costs about 3,299.99 RON (around $696 USD), so I'm wondering whether the extra cost is worthwhile. How much do latency, response time, and gaming performance change between these kits? My system will use a Ryzen 7 9800X3D, RTX 5070 Ti, B850 motherboard, Arctic liquid cooler, and a 1,000W power supply. I mainly play competitive Fortnite, but I'd also like to know whether the difference matters in other games. Would an 850W PSU be sufficient?
4 Answers
The 9800X3D can still benefit from memory tuning, especially tighter secondary and tertiary timings, but that usually involves manual tweaking and testing. For a normal plug-and-play build, DDR5-6000 with decent timings is the sensible target. Paying a large premium for CL30 is generally not worthwhile unless the price difference is small.
That makes memory tuning somewhat more relevant, but the difference between these kits is still modest. A faster GPU setting, CPU limit, or properly tuned graphics configuration will usually matter more than moving from CL36 to CL30.
For 4K or visually demanding single-player games, you probably won't notice any difference. At 1080p or 1440p with very high refresh rates, especially in competitive games, CL30 may provide slightly better average FPS or 1% lows, but CL30 versus CL36 is still unlikely to transform the experience. Buy the cheaper kit if the price difference is substantial, as long as it is a reputable DDR5-6000 EXPO kit with otherwise comparable timings.
An 850W power supply should be enough for a 5070 Ti and 9800X3D, provided it is a high-quality model with the proper modern GPU power connector. A good 1,000W unit is also perfectly fine and gives extra headroom; just don't choose a cheap unit based only on its wattage rating. Your system should normally stay well below 700W in gaming.
At DDR5-6000, the approximate first-word latency is 10ns for CL30, 10.67ns for CL32, 11.33ns for CL34, and 12ns for CL36. That sounds like a noticeable increase, but the real-world gaming difference is usually very small—often around 0–2%, and sometimes within normal benchmark variation. With a 9800X3D, the large cache makes memory latency even less important in most games.
I mainly play competitive Fortnite, so I care more about high FPS and consistent frame times than maximum visual quality.