Iris Plus Graphics 645 vs Radeon HD 4870

G3D Mark is a standard benchmark that measures graphics performance in real-world gaming scenarios. It simplifies comparing cards from different brands, where higher scores directly correlate with better fps and smoother gaming experiences.

Iris Plus Graphics 645 vs Radeon HD 4870 FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with Ryzen 7 9800X3D to isolate GPU performance.

Search any supported game below to compare 1080p FPS for both components.

Iris Plus Graphics 645 vs Radeon HD 4870: Pros, Cons & Final Verdict

See where each GPU makes more sense in practice: raw FPS, VRAM, features, power draw, pricing, and long-term headroom.

Iris Plus Graphics 645

2019

Why buy it

✅Draws 15W instead of 150W, a 135W reduction.
✅More future proof: Generation 9.5 (2016−2020) on 14nm with a newer platform for upcoming games.

Trade-offs

❌Less VRAM, with Unknown vs 2 GB for high-resolution textures and newer games.
❌2019 hardware with Unknown of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌Lower G3D Mark per dollar, at 0 vs 4.6 G3D/$ (Unknown MSRP vs $299 MSRP).

Radeon HD 4870

2008

Why buy it

✅Delivers 100+% more G3D Mark for each dollar spent, at 4.6 vs 0 G3D/$ ($299 MSRP vs Unknown MSRP).
✅100+% more VRAM for high-resolution textures and newer games (2 GB vs Unknown).
✅Iris Plus Graphics 645 is already obsolete for modern gaming, so Radeon HD 4870 is the less risky modern option long term.

Trade-offs

❌2008 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌900% higher power demand at 150W vs 15W.

Quick Answers

Which GPU is faster for gaming right now?

Iris Plus Graphics 645 is the faster gaming card right now based on the synthetic data we have. It leads by 4.6% in PassMark G3D (1,450 vs 1,386), which is the best performance signal available in this matchup.

Which GPU is the safer long-term pick for 2026 and beyond?

Radeon HD 4870 is the safer long-term pick for 2026 and beyond. The case is simple: 2 GB vs Unknown of VRAM and the newer upscaling stack, FSR Upscaling / FSR 4 (2025) instead of no meaningful modern upscaling stack. That gives it more room for heavier textures and higher settings over time.

Which GPU is the better buy today?

Radeon HD 4870 makes the most sense today based on the pricing and value data we have for this matchup. Iris Plus Graphics 645 still makes more sense if max raw gaming performance matters more than value.

Iris Plus Graphics 645 vs Radeon HD 4870 Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Iris Plus Graphics 645

The Iris Plus Graphics 645 is manufactured by Intel. It was released in October 7 2019. It features the Generation 9.5 architecture. The core clock ranges from 300 MHz to 1050 MHz. It has 384 shading units. The thermal design power (TDP) is 15W. Manufactured using 14 nm+++ process technology. G3D Mark benchmark score: 1,450 points.

Radeon HD 4870

The Radeon HD 4870 is manufactured by AMD. It was released in June 25 2008. It features the TeraScale architecture. The core clock speed is 750 MHz. It has 800 shading units. The thermal design power (TDP) is 150W. Manufactured using 55 nm process technology. G3D Mark benchmark score: 1,386 points. Launch price was $299.

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Graphics Performance

The Iris Plus Graphics 645 scores 1,450 and the Radeon HD 4870 reaches 1,386 in the G3D Mark benchmark — just a 4.6% difference, making them near-identical in rasterization performance. The Iris Plus Graphics 645 is built on Generation 9.5 while the Radeon HD 4870 uses TeraScale, both on 14 nm+++ vs 55 nm. Shader units: 384 (Iris Plus Graphics 645) vs 800 (Radeon HD 4870). Raw compute: 0.8064 TFLOPS (Iris Plus Graphics 645) vs 1.2 TFLOPS (Radeon HD 4870).

Feature	Iris Plus Graphics 645	Radeon HD 4870
G3D Mark Score	1,450+5%	1,386
Architecture	Generation 9.5	TeraScale
Process Node	14 nm+++	55 nm
Shading Units	384	800+108%
Compute (TFLOPS)	0.8064 TFLOPS	1.2 TFLOPS+49%
ROPs	6	16+167%
TMUs	48+20%	40

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Advanced Features (DLSS/FSR)

Feature	Iris Plus Graphics 645	Radeon HD 4870
Upscaling Tech	Upscaling support	FSR Upscaling / FSR 4
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	Standard	AMD Anti-Lag

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Video Memory (VRAM)

The Iris Plus Graphics 645 has 0 MB of VRAM, while the Radeon HD 4870 carries 2 GB. Radeon HD 4870 gives you 100+% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is System on the Iris Plus Graphics 645 and 64-bit on the Radeon HD 4870.

Feature	Iris Plus Graphics 645	Radeon HD 4870
VRAM Capacity	Shared System RAM	2 GB
Memory Type	Shared	GDDR5
Memory Bandwidth	System	Unknown
Bus Width	System	64-bit

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Power & Dimensions

The Iris Plus Graphics 645 draws 15W versus the Radeon HD 4870's 150W — a 163.6% difference. The Iris Plus Graphics 645 is more power-efficient. Recommended PSU: 1W (Iris Plus Graphics 645) vs 500W (Radeon HD 4870). Power connectors: Integrated vs 2x 6-pin.

Feature	Iris Plus Graphics 645	Radeon HD 4870
TDP	15W-90%	150W
Recommended PSU	1W-100%	500W
Power Connector	Integrated	2x 6-pin
Perf/Watt	96.7+951%	9.2

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Value Analysis

At launch, the Iris Plus Graphics 645 came in at $0, while the Radeon HD 4870 launched at $299. On MSRP, Iris Plus Graphics 645 was 100+% cheaper ($299 less). Performance per dollar on MSRP (G3D Mark / MSRP): Infinity (Iris Plus Graphics 645) vs 4.6 (Radeon HD 4870) — the Iris Plus Graphics 645 offers Infinity% better value. The newer card here is Iris Plus Graphics 645 (2019 vs 2008).

Feature	Iris Plus Graphics 645	Radeon HD 4870
MSRP	$0-100%	$299
Performance per Dollar	Infinity	4.6
Codename	Coffee Lake GT3e	RV770
Release	October 7 2019	June 25 2008
Ranking	#720	#784

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