is DDR5 a scam? My $350 2007 Dell Precision is destroying my $1500 2025 RTX 5070 rig in agentic tasks. made possible by Prism32

I had a theory that ram speed didn't really matter and the only thing that matters is your GPU capacity, vram speed, vram size, and system ram size instead of ram speed or cpu speed. I think I've been vindicated. I used unsloth/Qwen3.8-27B-GGUF:UD-IQ3\_XXS (10.9gb) https://huggingface.co/unsloth/Qwen3.8-27B-GGUF as my baseline and mtp q4\_0 1.37gb only on the dual gpu systems because mtp was too slow on the 9060xt and 5070 I used llama.cpp for all of them and tried to go for the max context I could since they are supposed to be day to day agents. I picked prism32 as my agent harness for this because it's the most compatible, fastest, and reliable one I've found. It's a custom architecture https://github.com/MegaDyneSystems/prism32 which gives it some massive advantages, especially if you want to avoid bloated frameworks eating your context or CPU. The 2007 system literally doesn't work with any other harness because they all require sse4.2 and a ton of heavy dependencies. prism32's only dependency is python 3.7 or above. It's so lightweight (uses around 5 to 10mb ram) that I actually run it bare metal on my ARM synology NAS and even my 2008 TP-link router. If you want to run any agents especially with advanced features on edge or legacy hardware without it choking your system their is no competition I tried these 5 systems: 2007 dell precision t5400 ddr2: 24gb ddr2 8 core 8 thread dual xeon x5460, rx 6700xt rx 6700 22gb vram total, 215gb ssd total system memory 46gb (pic 1) 2009 dell precision t5500 ddr3: 72gb ddr3 12 core 24 thread dual xeon x5675, rtx 5060 rtx 4060 16gb vram total, 512gb ssd, total system memory 88gb (pic 2) 2012 dell precision t3600 ddr3: 64gb ddr3 6 core 12 thread xeon e5-1650, rtx 4060, rtx 3060 12gb total vram 20gb, 512gb ssd, total system memory 84gb 2018 hp obelisk desktop 875 ddr4: 32gb ddr4 3200 i7 8700, rx 9060 xt 16gb, total vram 16gb 512gb ssd, total system memory 48gb (pic 3 ) * 2025 HP omen: 32gb ddr5 6000 RTX 5070 12gb GDDR7 vram 1tb ssd, total 44gb memory (pic 4) The speed results on each system were: 2007 dell precision ddr2 144k context, 18 tk's a second decode, 150tk's prompt processing 2009 dell precision t5500 ddr3 256k context 22 tokens a second decode, 224 tokens prompt processing 2012 dell precision t3600 ddr3 104k context 22 tokens a second short context 14 tokens a second long context, prompt processing is 315 tokens, (could optimize further but tests took me long enough) 2018 hp obelisk 875 ddr4 180k context, 16 tokens a second long decode, 477 promp processing 2025 HP omen 131k 13 tokens a second, 43 prompt processing (yes 43) conclusion The older dual xeon dual gpu setups completely destroyed the newer stuff in context length and speed even on worse GPU's which I think proves my theory, The HP omen system is at least $1500 and the 2007 system didn't cost more than 400 total, rx 6700 xt was $190, rx 6700 was $140, on ebay they are overpriced at $150 although I got it $50 second hand in 2014, and the DDR3 systems were $20 second hand and go around 80 to 150 on ebay, I'd say the ddr3 systems are the best for performance and value, next project is running qwen 3.8 flash next on the ddr3 systems