# Pre-RFC: Gradual Transition of NixOS x86\_64 Baseline to x86-64-v3 with an Intermediate Step to x86-64-v2

**URL:** https://discourse.nixos.org/t/pre-rfc-gradual-transition-of-nixos-x86-64-baseline-to-x86-64-v3-with-an-intermediate-step-to-x86-64-v2/35924
**Category:** RFCs
**Created:** [November 23, 2023, 5:45pm UTC](https://discourse.nixos.org/t/pre-rfc-gradual-transition-of-nixos-x86-64-baseline-to-x86-64-v3-with-an-intermediate-step-to-x86-64-v2/35924 "2023-11-23T17:45:01Z")
**Posts on this page:** 1
**Showing post:** 38

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### Author: ![riceicetea](https://discourse.nixos.org/user_avatar/discourse.nixos.org/riceicetea/32/7034_2.png) [@riceicetea](https://discourse.nixos.org/u/riceicetea)
#### Post date: [December 2, 2023, 9:12am UTC](https://discourse.nixos.org/t/pre-rfc-gradual-transition-of-nixos-x86-64-baseline-to-x86-64-v3-with-an-intermediate-step-to-x86-64-v2/35924/38 "2023-12-02T09:12:29Z")

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> [@Flakebi](#):
>
> using -O3

As far as I’m aware, we are not using O3 because sometimes decreases performance (by agressive unrolling, etc).

But, has anyone ever benchmarked a full-o3 system to an o2 system?

It might be more relevant than x86-64-v2 since it doesn’t involve dropping hardware.

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