Ok, turning off Turbo Boost will cause major HQP performance problems 
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Glad I didn’t touch that!! 
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Just so. Given the nature of bitstream processing, I’m assuming that HQP doesn’t use GPU?
HQPlayer can offload filters and convolution to Nvidia GPU. HQPlayer has pretty extensive support for CUDA.
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That’s v useful to know - pity that the machine I have in mind has an AMD GPU (6800XT). Think I’ll test on that and might then consider a custom build on Nvidia, to serve as a media playout/DSP system. Is there a sweet spot for CPU/GPU spec?
Look for something with high as possible base and turbo clock rates that has as many cores as possible. For example 7900X looks pretty nice. For GPU it makes sense to pay attention to amount of RAM if you want to run those big filters. 16 GB of GPU ram may become handy for DSD512.
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I bought a Klipsch R-121SW for speakers and I can tell you that it works with anti-mode. 
@jussi_laako if you tested / based on your experience - would the extra cache on a 7xxx X3D CPU provide any performace benefits, or the higher base clock is preferable?
I’m trying to decide between 7700X and 7800X3D (or even 7950X and 7950X3D) for a future build. In 7950X3D’s case, which CCD will be prefered by HQPlayer - the one with the extra cache or the one with the higher clocks?
note: I’m currently testing HQPlayer Embedded on a Ryzen 9 6900HX with 32 GB DDR5 4800 (Minisforum UM690) playing to a Topping D50s DAC (via RoPieee-XL). It can handle upsampling to DS512 (dac-bits 0, autorate family & 48k DSD enables) with any poly-sinc / minring filter combinations i tried so far, but closed-form & sinc-* filters are too much for it (gonna try them at DSD256 when i have some spare time).
I wish I knew. I’ve been contemplating between the two models trying to decide which one I should get. This should be benchmarked with HQPlayer. Unfortunately it is quite a bit of effort and little expensive.
From technical perspective, modulators benefit from the higher clock speed. And filters from the larger cache - in case the filters are large. So in the end it also depends on your needs and configuration.
This is the most likely area where X3D can give benefits.
