B300 vs MI325X
B300 starts at $4.99/GPU-hour on-demand; MI325X starts at $3.80/GPU-hour on-demand. Compare the exact variants, memory and published specifications below. GPU spec numbers are not benchmarks.
23.8% cheaper at MI325X.
checked 13 October 2026. Price alone does not establish equivalent capacity or performance.
B300
MI325X
Spec sheet
| B300 | MI325X | |
|---|---|---|
| Spec variant | B300 | MI325X |
| Architecture | Blackwell Ultra | CDNA 3 |
| VRAM (spec variant) | 288 GB | 256 GB |
| FP16 TFLOPS (dense) | 2250 | 1307 |
| Memory bandwidth | 8000 GB/s | 6000 GB/s |
| TDP | 1400 W | 1000 W |
| Interconnect | NVLink 1800GB/s | Infinity Fabric |
| Launched | 2025 | 2024 |
Rental price per manufacturer-rated FP16 compute: B300 $2.22 per PFLOP-hour vs MI325X $2.91. Formula: cheapest $/hr ÷ dense FP16 PFLOPS (1 PFLOP = 1000 TFLOPS). This uses B300 and MI325X, whose datasheets may differ from the variants above. It is not measured job throughput. Specs: B300 manufacturer, MI325X manufacturer.
What they cost to rent (13 October 2026)
| B300 | MI325X | |
|---|---|---|
| Cheapest on-demand $/hr | $4.99 | $3.80 |
| Cheapest spot/community $/hr | $4.08 | $2.00 |
| Cheapest source | Prime Intellect | DigitalOcean |
| Providers offering it | 17 | 2 |
Cheapest on-demand rate; the cheaper one is highlighted. Spot/marketplace tiers shown on the individual pages.
FAQ
MI325X is cheaper: the B300 rents from $4.99 per GPU-hour and the MI325X from $3.80 on-demand, checked 13 October 2026.
The largest recorded B300 variant has 288 GB and the largest MI325X variant has 256 GB. Other variants may have less memory. The B300 has more.
Compare more rental options: the screener · price movers · methodology.