Interactive · pick real products, watch the physics settle
Rack builder — the product picker Select a real cooling product and real server platforms, set the room, and watch capacity derate against it. Server watts are TDP budgets (ΣGPU + ΣCPU) × 1.2 from public specs — every selection links its source. Same physics as the formulas section .
Cooling product Vertiv CoolChip CDU 70 (L2A) L2A · 86.5 kW @ 25 °C / 45 °C coolant 50 kW-class L2A cabinet (generic) L2A · 50 kW @ 25 °C / 45 °C coolant 30 kW-class L2A cabinet (generic) L2A · 30 kW @ 25 °C / 45 °C coolant STULZ × CoolIT Micro DC L2A · 27 kW @ 25 °C / 45 °C coolant Asetek InRackCDU (L2L) L2L · 100 kW CoolIT CHx80 (L2L in-rack) L2L · 80 kW CoolIT CHx200 (L2L in-rack) L2L · 200 kW CoolIT CHx2000 (L2L row) L2L · 2000 kW Motivair CDU family (L2L floor) L2L · 105 kW Envicool 机柜式风液 CDU (Coolinside) L2A · ❌ rating not published
No facility water — but the room must absorb ~1.1× IT load in AC · source ↗
Servers NVIDIA GB200 NVL72 rack — 120 kW / 42U NVIDIA GB300 NVL72 rack (Blackwell Ultra) — 140 kW / 48U NVIDIA Vera Rubin NVL72 rack — 220 kW / 48U 8× B200 node (HGX B200) — 10.5 kW / 8U 8× B300 node (HGX B300, Blackwell Ultra) — 12.4 kW / 8U 8× Rubin node (HGX/DGX Rubin NVL8) — 22.9 kW / 2U 8× H100 SXM node (HGX H100/H200) — 7.6 kW / 8U 8× MI300X node (AMD Instinct) — 8.1 kW / 8U Dell PowerEdge XE9680 — 10.2 kW / 6U Supermicro SYS-821GE-TNHR — 7.6 kW / 8U HPE Cray XD670 — 7.6 kW / 5U Lenovo ThinkSystem SR685a V3 — 8.1 kW / 8U Huawei Atlas 900 liquid-cooled rack (Ascend) — 50 kW / 42U 2U CPU node (2× 360 W) — 0.9 kW / 2U 2U storage JBOD — 0.5 kW / 2U + Add
42U RACK · 32U USED
8× H100 SXM node (HGX H100/H200) ×4 · 7.6 kW
8× H100 SXM node (HGX H100/H200): 8× H100/H200 SXM (700 W) + 2× CPU (360 W) —
spec ↗ Readouts LIQUID LOAD vs DERATED CAPACITY
24.3 kW / 86.5 kW (28%)
RACK SPACE
32U / 42U
ROOM
Room temp 25 °C Capacity derates with room air (why )
✅ Fits — 72% thermal headroom, 10U free, at 25 °C
Total IT 30.4 kWHeat to liquid 24.3 kWHeat to air 6.1 kWCoolant flow @ ΔT 8 °C 44 L/minCapacity at 25 °C room 86.5 kWRoom AC (1.1×) 33.4 kW ≈ 9.5 tons
FIG. 1 — Live build. Flow: L/min = kW × 60 / (4.186 × ΔT). Derating: approach-temperature model on the selected product's rating point. Watts are TDP budgets, not measured draw.Try this Add one GB200 NVL72 rack with the 30 kW cabinet selected → the gap is the whole story: no single-cabinet class fits a 120 kW rack. 8× H100 × 4 nodes + Vertiv CDU 70 → fits at 25 °C; slide the room to 35 °C and watch the verdict flip. Switch to Asetek L2L → capacity stops derating, but the facility-water requirement takes over the room-AC line.