新川サーバー | エンタープライズ サーバー ハードウェア サプライヤー
あなたのサーバーには 32 DIMM Slots. All Populated. Memory Utilization at 94 Percent. The Cluster Needs More RAM, Not More Servers.
Every VMware admin knows this moment. The cluster shows 94 percent memory utilization. The budget meeting is in three days. The options are grim: buy another $40,000 サーバ, throttle VM density, or let performance degrade. The Samsung 512GB CXL Memory Module adds a fourth option: plug a PCIe 5.0 card into an empty slot, and the hypervisor sees 512 GB of additional system memory — byte-addressable, NUMA-aware, and managed by the same memory controller that handles DDR5.
技術仕様
| パラメータ | 仕様 |
|---|---|
| 容量 | 512 GB (また: 256 GB variant) |
| Protocol | CXL 2.0 (タイプ 3 memory expander), backward-compatible with CXL 1.1 |
| Host Interface | PCIe 5.0 x8 (or x16, configurable) |
| Memory Technology | Samsung 1a-class DDR5 DRAM (high-density, not NAND — true DRAM latency profile) |
| Latency (CXL 2.0, local NUMA node) | ~250-300 ns (vs ~90 ns for socket-local DDR5, vs ~140 ns for remote-socket DDR5 on dual-socket) |
| 帯域幅 | ~32 GB/s (PCIe 5.0 x8) to ~64 GB/s (x16) |
| フォームファクタ | PCIe full-height, 半長さ (FHHL) add-in card |
| 力 | ~25W typical, ~40W max |
| ECC | On-module ECC (Samsung in-module error correction, independent of host ECC) |
| RAS Features | Memory sparing, memory mirroring (module-level), patrol scrub, demand scrub |
| ホットプラグ対応 | Not supported. Memory capacity changes require reboot. |
| NUMA | Exposed as a separate NUMA node to the OS. OS memory manager balances allocations. |
| OSサポート | RHEL 9.2+ (kernel 5.14+ CXL subsystem), SLES 15 SP5+, Ubuntu 24.04 LTS, ヴイエムウェア ESXi 8.0 U2+ (CXL memory tiering in preview) |
| Compatible CPUs | Intel Xeon 4th Gen (CXL 1.1), ゼオン 6 (CXL 2.0), AMD EPYC 9005 (CXL 2.0) |
| Compatible Servers | Dell R660, R760, R770, R7715, R860, R960, xFusion 2288H V7, 2488H V7, 5885H V7 (CXL BIOS enabled) |
| 物理的な | Standard PCIe FHHL card, 168 バツ 111 んん |
| 保証 | 3-年 (サーバー付き) |
CXL Memory vs Adding DIMMs — The Expansion Math
| Scenario | Add DDR5 DIMMs | Add CXL Modules | Winner |
|---|---|---|---|
| Server has empty DIMM slots | 16バツ 64 GB DDR5 = 1 TB added. 料金: ~$8,000. No PCIe slots consumed. | 2バツ 512 GB CXL = 1 TB added. 料金: ~$5,000. 2 PCIe slots consumed. | Dr5 (cheaper per GB, no PCIe penalty) |
| Server DIMM slots are FULL | Impossible without replacing server. | 2バツ 512 GB CXL = 1 TB added. 料金: ~$5,000. | CXL (only option) |
| Need > 8 TB total on a 2-socket server | Impossible. 32 DIMM slots x 256 GB = 8 TB ceiling. | 8 TB DDR5 + 2 TB CXL = 10 TB total on a dual-socket server. | CXL breaks the 8 TB ceiling |
When CXL Memory Makes Sense
- VMware clusters at memory saturation. Add CXL modules to existing hosts instead of buying more hosts. 512 GB of CXL memory per host x 10 hosts = 5 TB of additional cluster memory at roughly 60% of the cost of adding two new servers.
- In-memory databases that outgrew the DIMM ceiling. Redis, Memcached, SAP HANA, and Oracle In-Memory that need >8 TB on a dual-socket server. CXL is the only path beyond the 32-DIMM ceiling without moving to a 4-socket R860.
- AI inference with large context windows. LLM inference with 100K+ token context windows consumes VRAM for the model weights and system RAM for the KV cache. CXL memory provides a cost-effective expansion tier for KV cache overflow.
When CXL Memory Does Not Make Sense
- If you have empty DIMM slots. Populate them first. DDR5 is faster and cheaper per gigabyte.
- If your workload is latency-sensitive at the nanosecond level. CXL adds 150-200 ns of latency vs socket-local DDR5. For high-frequency trading, real-time control systems, and OLTP with strict latency SLAs, native DDR5 is the only option.
- If your OS or hypervisor does not support CXL memory tiering. ヴイエムウェア ESXi 8.0 U2 supports CXL memory in preview (not GA). RHEL 9.2+ supports it GA. Check your hypervisor version before ordering.
新川経由のソース
We supply Samsung CXL modules pre-installed in Dell and xFusion servers with CXL BIOS enabled. 工場直送価格, 3-年保証, and free CXL memory planning consultation.
