AMD EXPO ULL RAM uses optimised memory timings to reduce DDR5 memory latency and improve gaming performance on compatible Ryzen systems.
AMD EXPO ULL RAM: Low-Latency DDR5 Memory
Ultra Low Latency RAM (ULL RAM) is memory designed to deliver particularly low latency through optimised timings. These RAM modules are available in different speeds and capacities, making them suitable for high-performance gaming PCs with Ryzen CPUs.
What Makes ULL RAM Special?
Compared to conventional AMD EXPO RAM, Ultra Low Latency RAM features additionally optimised subtimings to further reduce memory latency. These include, for example:
- tRFC: Affects the duration of a memory refresh operation
- tRRD: Defines the time interval between certain activation commands
By specifically optimising these subtimings, waiting times can be reduced and memory access can be made more efficient.
Ultra Low Latency RAM: Benefits for Gaming
AMD EXPO ULL RAM can offer advantages particularly in CPU-limited games. According to AMD's own tests using a Ryzen 7 9700X and DDR5-6000, EXPO ULL achieved around 4% higher average FPS and approximately 4% higher 1% low FPS compared to conventional EXPO. Higher 1% lows can contribute to a smoother gaming experience.
The increase in average frame rates is particularly noticeable in CPU-limited games, where the processor frequently needs to access data stored in RAM. Thanks to lower latency, these memory accesses can be completed faster, allowing the CPU to process its tasks more efficiently.
What Should I Look for When Buying a ULL RAM Kit?
Processor
AMD EXPO ULL RAM was developed specifically for Ryzen CPUs on the AM5 platform. The technology is particularly interesting for Ryzen CPUs without 3D V-Cache, as these can benefit more from lower memory latency.
Motherboard Compatibility
Your AM5 motherboard must support the corresponding EXPO ULL profile. Check the motherboard manufacturer's specifications and make sure you're using a compatible BIOS version.
Memory Speed and Timings
Besides the data transfer rate in MT/s, primary timings and optimised subtimings are crucial. A low CL value alone doesn't automatically mean lower overall latency.
Memory Capacity
For modern gaming PCs, 32 GB is a good choice. If you also edit videos, stream or use memory-intensive applications, 64 GB may be worthwhile.
Find Out More
Learn more about ULL RAM and its benefits!
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FAQ – AMD EXPO ULL RAM
What's the Difference Between AMD EXPO and EXPO ULL?
AMD EXPO allows you to enable preconfigured memory profiles with specific speeds and timings in the BIOS. EXPO ULL extends this technology with additionally optimised subtimings. This can further reduce memory latency without requiring you to adjust individual values manually.
Do I Need to Enable AMD EXPO ULL in the BIOS?
Yes. To take advantage of the optimised memory settings, you need to enable the corresponding EXPO ULL profile in your motherboard's BIOS. Depending on the manufacturer, you'll find this option in the memory or overclocking settings. Without enabling the profile, the RAM will generally run at its default JEDEC settings.
Can I Use ULL RAM with a Ryzen X3D Processor?
Yes. AMD EXPO ULL RAM can also be used with compatible Ryzen X3D processors. However, due to their large 3D V-Cache, these processors often benefit less from lower memory latency than Ryzen CPUs without 3D V-Cache. The actual performance difference depends on the game.
Can I Upgrade My Existing DDR5 RAM to EXPO ULL?
A standard DDR5 kit cannot be converted into an EXPO ULL kit simply through a BIOS update. The corresponding memory profiles must be stored on the RAM modules themselves. Alternatively, you can manually optimise the subtimings of compatible memory. However, this requires additional configuration and stability testing.
Is EXPO ULL RAM Compatible with Older AM5 Motherboards?
Older AM5 motherboards may also support AMD EXPO ULL, provided the manufacturer makes the corresponding memory profiles available through the BIOS. A BIOS update may be required. Before buying, check your motherboard's compatibility information and supported memory profiles.
