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. Peak compute figures do not establish application speed.
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 (2026-10-02)
| B300 | MI325X | |
|---|---|---|
| Cheapest on-demand $/hr | $4.99 | $3.80 |
| Cheapest spot/community $/hr | $4.99 | $2.00 |
| Cheapest source | Prime Intellect | DigitalOcean |
| Providers offering it | 13 | 2 |
Lowest recorded on-demand rate per configuration; highlighted = cheaper. 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, updated 2026-10-02.
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.