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PlayStation Memory Architecture by Generation: PS1 to PS5

Sony has employed distinct memory architectures each generation, balancing cost, bandwidth, and developer accessibility.

Generational Breakdown

Console	Main RAM (System + Video Unified)	Type / Bus	Bandwidth	Storage Media	Internal Storage
PS1 (1994)	2 MB	Fast Page Mode DRAM	~133 MB/s	CD-ROM (650 MB)	Memory Cards (128 KB)
PS2 (2000)	32 MB	RDRAM (Direct RDRAM) 32-bit @ 400 MHz	3.2 GB/s	DVD-ROM (4.7/8.5 GB)	Memory Cards (8 MB) + HDD (Expansion Bay, 40 GB)
PS3 (2006)	256 MB XDR + 256 MB GDDR3	XDR (System) @ 3.2 GHz / GDDR3 (RSX VRAM) @ 700 MHz	25.6 GB/s (XDR) + 22.4 GB/s (GDDR3)	Blu-ray (25/50 GB)	20–500 GB HDD (2.5" SATA)
PS4 (2013)	8 GB	GDDR5 256-bit @ 5.5 GHz	176 GB/s	Blu-ray (50 GB)	500 GB / 1 TB HDD (User-replaceable 2.5" SATA)
PS4 Pro (2016)	8 GB + 1 GB DDR3 (OS)	GDDR5 256-bit @ 6.8 GHz	218 GB/s	Blu-ray	1 TB HDD
PS5 (2020)	16 GB	GDDR6 256-bit @ 14 GHz	448 GB/s	UHD Blu-ray (66/100 GB)	Custom 825 GB NVMe SSD (5.5 GB/s Raw) + Expansion Slot

Key Architectural Notes

PS1/PS2: Main RAM used for everything (framebuffer, textures, code). PS2's RDRAM was high-latency, high-bandwidth—difficult to optimize.
PS3 Split Pool: 256 MB XDR (Cell CPU) + 256 MB GDDR3 (RSX GPU). Not unified; developers had to manually manage data transfer between pools via DMA—a major pain point.
PS4 Unified GDDR5: Single 8 GB pool for CPU+GPU. Huge bandwidth (176 GB/s) simplified development (similar to Xbox One's DDR3+ESRAM but faster).
PS5 Unified GDDR6 + Custom SSD: 16 GB at 448 GB/s. The I/O complex (Kraken decompression, DMA, coherency engines) lets the GPU/CPU stream assets directly from the SSD at RAM-like speeds, effectively using the SSD as extended memory.
OS Overhead: PS4 reserves ~3.5 GB for OS; PS5 reserves ~2.5 GB (more efficient). Games get ~4.5 GB (PS4) / ~13.5 GB (PS5) usable.

Why It Matters

Memory bandwidth and architecture dictate texture resolution, world size, loading times, and physics complexity. The shift from split pools (PS3) → unified GDDR5 (PS4) → unified GDDR6 + hardware decompression (PS5) is the single biggest enabler of modern open-world density and instant loading.

Sony PSP