Comparing Ryzen 7000 X with non-X models in eco and PBO metrics
Comparing Ryzen 7000 X with non-X models in eco and PBO metrics
Hey there! I’m updating my setup because my old gear is getting a bit outdated. I’m thinking about a new build featuring an AMD Ryzen 9 7900(X), likely with an ASUS TUF Gaming B650-Plus (though I’m still figuring out if PCIe 5.0 is necessary). I plan to use 32GB of DDR5-6000 RAM and a 4080 class GPU. What I appreciate about the AMD chips is that they’re unlocked, which gives me more flexibility compared to Intel’s non-K CPUs from the 13th generation.
Initially, I’ll run the 7900(X) at around 65W TDP, enjoying the ability to boost performance without needing a later upgrade. Now, a few questions:
- When I want better speed, should I enable PBO on the 7900 and pair it with the B650? Is there a way to slowly increase its TDP, or is it fixed at 65W?
- Should I opt for the 7900X in Eco Mode? Is that feasible on the B650 platform?
If yes, can I set a specific TDP (or even a percentage) instead of just using the default? Also, regarding cost, the price gap between the 7900 and 7900X is only €2-3 at roughly €460 total—so it’s almost negligible.
I’ve read mixed reviews about performance differences between a PBO-enabled 7900 and a stock 7900X, but I think that’s not a big deal. Overall, based on what I know, the core specs should match a regular 7900, right?
Thanks a lot for your help!
Edited: January 31, 2023 – Updated by ubernap (AMD/Intel comparison)
I tested my 7900x with a Curve Optimizer undervolt and it worked perfectly (part of PBO). Recently I switched to using the temp limit presets in my Asrock BIOS (X670E Taichi) and everything is running smoothly. It's faster than the original and stays at 85°C. I haven't explored power limit settings yet, but I'm planning to check them out soon. I'm using the 85C and CO-40mV mode.
Partially accurate, since you need a specific K-SKU (or X on HEDT) to unlock the multiplier. Otherwise, they remain restricted. With PBO, you can simply adjust the PPT to a lower wattage, which caps the CPU's power usage and thus lowers energy consumption. You'll need to access BIOS to disable this setting so the chip operates at its default power limit.
Absolutely! It’s interesting how these comparisons work. Comparing Intel 13-gen non-K CPUs makes sense, but the idea of power limits like AMD’s Eco mode is a bit different. I’ve seen some info suggesting you can even adjust power settings using AMD’s Ryzen Master tool, which adds another layer of confusion. Some manufacturers offer presets for 65W, 105W, and 170W, while others let you set custom limits. It seems the main distinction might just be the default power targets, which can make choosing between models feel odd.
Absolutely, you're right about tweaking power settings like PL1 and PL2. Intel definitely boosts the voltage on these chips, so undervolting seems ideal when using Intel Raptor Lake. Of course, AMD Ryzen Master gives access to BIOS via a GUI, but it doesn't always fix software issues. The existence of X models likely stems from binning—chiplets in the process perform better or are more suitable for overclocking compared to non-X versions. Non-X parts should match the base performance of their X counterparts, just not exceed it. It's similar to how Nvidia labels their graphics cards: they're marginally superior to non-Ti models. The same applies to AMD with its XT and non-XT variants.
I made my own choice between these two models based on a small price difference. For a change of around $20 to $30, the 7900X seems more appealing. The PBO curve optimizer lets you tweak voltage offset and boost settings if needed.