Quick Answer
Calculate true RAM latency in nanoseconds: divide CAS latency by real clock frequency in megahertz, then multiply by 1000. Real clock speed equals half advertised transfer rate. Direct formula: multiply CAS latency by 2000, then divide by marketed MT/s. Resulting nanosecond value measures memory delay for comparing RAM kits accurately.
Pros
- 64GB total capacity as two 32GB modules
- Rated up to 6000MT/s with CL36-36-36-96 timings
- Lists AMD EXPO and Intel XMP 3.0 profile support
- RGB lighting in a matte black finish
Cons
- Speed rating is an 'up to' manufacturer-stated figure
- No reviews or motherboard compatibility lists supplied
Pros
- Exceptional expansion with 7 PCIe 5.0 x16 slots.
- Strong memory support with ECC R-DIMM DDR5 and up to 2TB capacity.
- Dual 10GbE networking plus dedicated remote management features.
- Workstation-focused power and thermal design for sustained loads.
Cons
- Only compatible with Intel Xeon W-3400 and W-2400 CPUs on the LGA 4677 platform, so it is not suitable for mainstream desktop builds.
- The CEB form factor may require a large, compatible workstation case.
- Its advanced feature set is aimed at professionals, so setup and component matching can be more complex than on consumer motherboards.
Overview & Design: The ASUS Pro WS W790 SAGE SE is a high-end workstation motherboard built around the Intel LGA 4677 socket. It is designed for Xeon W-3400 and W-2400 processors and uses a CEB layout that prioritizes expansion, power delivery, and professional system integration.
Performance & Key Features: This board stands out with seven PCIe 5.0 x16 slots, support for up to 2TB of ECC R-DIMM DDR5 memory, and dual Intel X710-AT2 10G LAN. It also includes server-grade IPMI remote management through an AST2600 BMC controller, plus ASUS Control Center Express for monitoring and administration. For storage and connectivity, it adds 3 M.2 slots, SlimSAS, and USB 3.2 Gen 2x2 Type-C.
Drawbacks & Considerations: The platform is highly specialized, so it only makes sense for users building around supported Xeon W processors. Its large CEB form factor may limit case compatibility, and the advanced feature set means it is better suited to experienced builders or IT teams than casual desktop users.
Verdict: This motherboard is a strong choice for professional workstations that need heavy PCIe expansion, high memory capacity, fast networking, and remote management. It is best for creators, engineers, and enterprise users who need a server-inspired foundation rather than a standard consumer motherboard.
Pros
- Listed for LGA 3647 Xeon W-3175X processors
- 12 DIMM DDR4 slots plus M.2 and U.2 storage listed
- Aquantia AQC-107 10G LAN and Intel I219-LM Gigabit LAN
- 32 power phases and 4-way PCIe 3.0 link per manufacturer
Cons
- Onboard Wi-Fi is 802.11ac (Wi-Fi 5), not newer standards
- Overclocking and cooling features are manufacturer-stated only
True RAM Latency: Why the Printed CAS Number Is Incomplete
Memory kits are marketed with a data rate (for example DDR5-6000) and a CAS latency (for example CL30). Each figure is incomplete alone. CAS latency (CL) is counted in memory clock cycles, not in time. A cycle at DDR4-2133 lasts nearly twice as long as a cycle at DDR4-4000, so identical CL values on different kits describe different real delays. Converting cycles to nanoseconds (ns) gives a common unit for comparing kits across speeds and generations.
The Formula
DDR (Double Data Rate) memory transfers data on both the rising and falling edges of the clock. The advertised figure in MT/s (mega-transfers per second) is therefore twice the actual I/O clock frequency in MHz. JEDEC specifications define timings in units of this I/O clock, so the conversion follows directly:
True latency (ns) = CL × 2000 ÷ data rate (MT/s)
An equivalent two-step form is useful for diagnostics:
- Actual clock (MHz) = data rate (MT/s) ÷ 2
- Clock period (ns) = 1000 ÷ clock (MHz); True latency (ns) = CL × clock period
The constant 2000 combines the DDR factor of 2 and the 1000 conversion from MHz to ns. The same method applies to any primary timing: tRCD (row-to-column delay), tRP (row precharge) and tRAS (row active time) are all counted in the same clock cycles.
Worked Examples
Example 1: DDR4-3200 CL16. The I/O clock is 1600 MHz, giving a period of 0.625 ns. True CAS latency = 16 × 0.625 = 10.00 ns.
Example 2: DDR5-6000 CL30. The I/O clock is 3000 MHz, giving a period of 0.3333 ns. True CAS latency = 30 × 0.3333 = 10.00 ns. Despite a CL nearly double that of the DDR4 kit, first-word latency is identical, while peak bandwidth is almost double.
Example 3: DDR5-4800 CL40 (JEDEC baseline). 40 × 2000 ÷ 4800 = 16.67 ns. This explains why entry-level DDR5 can show higher first-word latency than a well-tuned DDR4-3600 CL16 kit (8.89 ns).
