B300 vs MI355X
B300 starts at $4.99/GPU-hour on-demand; MI355X starts at $5.99/GPU-hour on-demand. Compare the exact variants, memory and published specifications below. GPU spec numbers are not benchmarks.
16.7% cheaper at B300.
checked 13 October 2026. Price alone does not establish equivalent capacity or performance.
B300
MI355X
Spec sheet
| B300 | MI355X | |
|---|---|---|
| Spec variant | B300 | MI355X |
| Architecture | Blackwell Ultra | CDNA 4 |
| VRAM (spec variant) | 288 GB | 288 GB |
| FP16 TFLOPS (dense) | 2250 | 2500 |
| Memory bandwidth | 8000 GB/s | 8000 GB/s |
| TDP | 1400 W | 1400 W |
| Interconnect | NVLink 1800GB/s | Infinity Fabric |
| Launched | 2025 | 2025 |
Rental price per manufacturer-rated FP16 compute: B300 $2.22 per PFLOP-hour vs MI355X $2.40. Formula: cheapest $/hr ÷ dense FP16 PFLOPS (1 PFLOP = 1000 TFLOPS). This uses B300 and MI355X, whose datasheets may differ from the variants above. It is not measured job throughput. Specs: B300 manufacturer, MI355X manufacturer.
What they cost to rent (13 October 2026)
| B300 | MI355X | |
|---|---|---|
| Cheapest on-demand $/hr | $4.99 | $5.99 |
| Cheapest spot/community $/hr | $4.08 | $2.59 |
| Cheapest source | Prime Intellect | Daytona |
| Providers offering it | 17 | 2 |
Cheapest on-demand rate; the cheaper one is highlighted. Spot/marketplace tiers shown on the individual pages.
FAQ
B300 is cheaper: the B300 rents from $4.99 per GPU-hour and the MI355X from $5.99 on-demand, checked 13 October 2026.
The largest recorded B300 variant has 288 GB and the largest MI355X variant has 288 GB. Other variants may have less memory. They match on maximum VRAM.
Compare more rental options: the screener · price movers · methodology.