B300 vs MI300X
B300 starts at $4.99/GPU-hour on-demand; MI300X starts at $2.39/GPU-hour on-demand. Compare the exact variants, memory and published specifications below. GPU spec numbers are not benchmarks.
52.1% cheaper at MI300X.
updated 2026-10-11. Price alone does not establish equivalent capacity or performance.
B300
MI300X
Spec sheet
| B300 | MI300X | |
|---|---|---|
| Spec variant | B300 | MI300X |
| Architecture | Blackwell Ultra | CDNA 3 |
| VRAM (spec variant) | 288 GB | 192 GB |
| FP16 TFLOPS (dense) | 2250 | 1307 |
| Memory bandwidth | 8000 GB/s | 5300 GB/s |
| TDP | 1400 W | 750 W |
| Interconnect | NVLink 1800GB/s | Infinity Fabric |
| Launched | 2025 | 2023 |
Rental price per manufacturer-rated FP16 compute: B300 $2.22 per PFLOP-hour vs MI300X $1.83. Formula: cheapest $/hr ÷ dense FP16 PFLOPS (1 PFLOP = 1000 TFLOPS). This uses B300 and MI300X, whose datasheets may differ from the variants above. It is not measured job throughput. Specs: B300 manufacturer, MI300X manufacturer.
What they cost to rent (2026-10-11)
| B300 | MI300X | |
|---|---|---|
| Cheapest on-demand $/hr | $4.99 | $2.39 |
| Cheapest spot/community $/hr | $4.08 | – |
| Cheapest source | Prime Intellect | RunPod |
| Providers offering it | 17 | 5 |
Cheapest on-demand rate; the cheaper one is highlighted. Spot/marketplace tiers shown on the individual pages.
FAQ
MI300X is cheaper: the B300 rents from $4.99 per GPU-hour and the MI300X from $2.39 on-demand, updated 2026-10-11.
The largest recorded B300 variant has 288 GB and the largest MI300X variant has 192 GB. Other variants may have less memory. The B300 has more.
Compare more rental options: the screener · price movers · methodology.