The 8 GB CMP 170HX's disabled memory partitions and compute clusters are gated, not all physically dead, but the gate that would turn them back on is fuse-locked. The reversible unlock ceiling of 64 GB and 74 SMs stands, per @darkmaniac7 (lab notes, November 5, 2026). Status: Reported.
What was found
The lab read the floorsweep of seven of its eight 8 GB cards (10de:20c2) with gpcprobe, the read-only tool by @matstatman, while the cmpunlocker 64 GB unlock (@amoghmunikote) was active. Nothing was written to any card. Every card shows the same shape:
| Unit | Active | Gated, not dead | Defective | Total |
|---|---|---|---|---|
| Framebuffer partition (FBP) | 8 | 2 | 2 | 12 |
| Compute cluster (GPC) | 5 | 2 to 3 | 0 to 1 | 8 |
All seven run 74 SMs, the known post-unlock ceiling.
What it means
- About 80 GB is physically latent: the 8 active partitions are the 64 GB in use, and the 2 gated ones are roughly 16 GB more.
- No volatile override exists. Reaching the gated partitions needs a one-time-programmable fuse burned, which is irreversible and can brick the card. See RIR fuse burn.
- 96 GB is not supported: 2 partitions per card are dead silicon, so even a fuse burn tops out near 80 GB.
- No extra usable memory was obtained. Whether memory sits behind the gated channels was not tested.
Why it came up
On November 4, 2026 @bvls7857 posted a gpcprobe summary row for an unlocked 8 GB card (FBP 8 healthy, 4 disabled, 2 defective). @cute_sc2 read it as 80 GB waiting to be unlocked, and @matstatman thought row remapping might reach 96 GB; neither has been tried. The same day @zagitta read a new 128 GB screenshot as "pretty much exactly 2x a 64gb unlocked card", two cards reported as one. The lab read puts numbers on the 80 GB and 96 GB question for the 8 GB card; see Rumours and claims to verify.