Hardware Specifications
| Parameter | Specification |
|---|---|
| GPU Architecture | AMD Vega 10 (NCU / GCN 5) — 14nm FinFET HPC |
| PCI Device ID | 0x687F (Vega 10 XT — shared with Vega 64) |
| Compute Units | 56 CUs — 3584 Stream Processors |
| Base Clock | 1156 MHz |
| Boost Clock | 1471 MHz |
| Memory Type | HBM2 — 2× 4GB stacks on interposer |
| Total VRAM | 8 GB HBM2 |
| Memory Interface | 2048-bit (2× 1024-bit per stack) |
| Memory Bandwidth | 410 GB/s |
| TDP | 210W (reference) |
| Power Connectors | 8+8 pin |
| Flash Tool | ATIFlash / VBFlash |
| BIOS Editor | Vega BIOS Editor (VBE) |
HBM2 Architecture and BIOS Implications
HBM2 on Vega 10 operates as two independent 4GB stacks, each connected via a 1024-bit interface to the GPU interposer. This 2048-bit total bus width with HBM2's native 1 Gbps per pin yields 410 GB/s total bandwidth — more than twice the GTX 1080's GDDR5X at 320 GB/s, and substantially higher than any GDDR5 card of the same era.
The BIOS implications of HBM2 differ from GDDR5 significantly. HBM2 timing is not exposed through Polaris BIOS Editor's timing strap system — the HBM2 controller and its timing parameters are managed by a different BIOS sub-system entirely. Vega BIOS Editor focuses instead on Power Gating tables, clock P-state tables, and fan policy — the modifications that matter most for Vega 10's performance behavior under power constraints.
The Vega 64 Cross-Flash Controversy
Vega 56 and Vega 64 use the same Vega 10 silicon die. AMD segments them by disabling Compute Units at the firmware level and setting lower power limits and clock ceilings in the Vega 56 BIOS. The logical conclusion — flash Vega 64 BIOS onto Vega 56 hardware to access full CU count and higher clocks — drove significant community experimentation at launch.
The cross-flash benefit that works universally — regardless of CU yield category — is the higher power limit and boost clock ceiling from the Vega 64 BIOS. Vega 64's 295W TDP versus Vega 56's 210W means the boost algorithm has more power budget to sustain higher clocks, even on hardware with 56 CUs. This portion of the cross-flash benefit is predictable and reproducible.
MorePowerTool and SPPT
Vega 10 is the architecture where MorePowerTool's SPPT (Soft Power Play Table) approach first achieved widespread adoption. Rather than modifying the BIOS flash, MorePowerTool writes a modified power table to a Windows registry key that the AMD driver reads at card initialization. This is safer — a system reboot without the registry key present reverts to the stock power table.
For Vega 56 specifically, MorePowerTool's SPPT can extend the sustained TDP ceiling and modify fan curve targets without requiring ATIFlash. The registry path varies by Windows version and AMD driver version — see the AMD flash guide for current registry path documentation.