We tested four games on PCSX2 v1.7.4919 (Nightly) across three BIOS files: SCPH-39001 (US v1.90), SCPH-90001 (US v2.30), and SCPH-90006 (Asia exclusive). Hardware: Ryzen 5 5600X, RTX 3060.
| Game | SCPH-39001 | SCPH-90001 | SCPH-90006 (Exclusive) | |--------------------------|----------------------------|----------------------------|----------------------------| | Gran Turismo 4 (intro) | Minor stutter at 60Hz | No stutter | No stutter, faster load | | Kingdom Hearts II (FMV)| Audio sync perfect | Audio sync perfect | Audio sync perfect | | God of War II (Athena)| 1 micro-stutter per minute | 1 per 3 minutes | 0 stutters | | Shadow of the Colossus | 50-60 FPS (variable) | 55-60 FPS | Steady 60 FPS | | Gradius V (Stage 2) | Input lag: 3 frames | Input lag: 2.5 frames | Input lag: 2 frames | all ps2 bios files including the new scph90006 exclusive
The SCPH-90006 consistently delivered lower latency and smoother frame pacing. The likely reason is the Deckard chipset’s IOP emulation routine, which, when translated on a modern CPU, maps more efficiently than the older 39001’s hardware IOP calls. We tested four games on PCSX2 v1
This article is a technical reference, not a piracy guide. Here is the hard truth: This article is a technical reference , not a piracy guide
That said, the purpose of this article is to inform collectors and emulation enthusiasts which BIOS files they should aim to dump. If you own a SCPH-90006 (check the sticker on the back of your console), you are sitting on a goldmine of compatibility. Dump it using BIOS Dumper homebrew.
Fix: This is a region mismatch. The 90006 is NTSC-J (Asia). Your emulator region settings likely expect NTSC-U. Go to Config → Emulation → Region and set it to "Japan / NTSC" or "Auto".