Gallium · FV-GL-H4

Gallium H4

Flagship HBM4 attach. 8-stack 16-Hi configuration delivering 512 GB unified memory across 16,384-bit bus. Hardware-managed 128k-entry KV-cache (fv_kv_cache) with Processing-in-Memory (PIM) expert-weight staging.

First tape-out

Editorial render of a partner HBM cube stack. Not a pinout.

Editorial 16-high partner cube. FairView does not claim the 1T1C array.

Public product lock. Empty JEDEC timings are omitted on purpose.
ParameterValue
SKUFV-GL-H4
AttachJESD270-4 silicon interposer
Attach modejesd270_4
External DQ2048 bits
Pin / identity rate8.0 Gbps JEDEC baseline
Bandwidth / stack2.048 TB/s
First package cubes8
First package bandwidth16 TB/s
Stack height16-hi
Die density32 Gb
Capacity / cube64 GB (= 16 × 32 / 8)
Capacity / package512 GB
Channels / pseudo-channels32 / 64
tCK0.250 ns
tRFC / tREFInot in pack — do not invent
VDDQ / VDDClegal option sets only; no selected rail

What this SKU is not

Not a Samsung 11.7 Gbps bin. Not 3.3 TB/s. Not a FairView DRAM factory. SPHBM4 46 GT/s is press-only and is not listed as a FairView lock.

All Gallium SKUsDesign-in
FV-GL-H4 Gallium H4