After the last article about system latency (NVIDIA Reflex & Boost vs. Radeon Boost and ZERO vs. AMD Anti-Lag), we should urgently discuss a few things about testing. So today we’re going to take a look at NVIDIA LDAT in terms of the USB ports it uses. For this I tested two different possibilities regarding the use of LDAT. The AMD Radeon RX 6700 XT was used here, whereby the AMD gimmicks (Anti-Lag and Radeon Boost) were deactivated for all measurements.
The only changes I made were to the respective USB ports. First, I connected NVIDIA LDAT to a second, stand-alone gaming PC so that the system latency measurements ran independently of my actual testbench. After that I coupled LDAT directly to the testbench. And to round it all off, I connected LDAT to one USB port directly connected to the CPU and once to a slower USB 2.0 port via chipset. Four variations, then, but more on that in a moment!
Here again my testbench in detail:
|CPU||Ryzen 7 2700X (4.2 GHz all core)|
|Mainboard||MSI MAG X570 ACE|
|RAM||2×8 GB G.Skill RipJaws V 3200 MHz CL16-18-38 (single ranked)|
|SSD 1||Toshiba Transcend 110S 256 GB (System)|
|SSD 2||Crucial P2 1000 GB (Games)|
|SSD 3||Crucial P2 1000 GB (Games)|
|SSD 4||Samsung 512 GB 840 Pro (Backup)|
|CPU Cooler||MSI MAG Coreliquid 360R|
|Power supply unit||Seasonic Prime Platinum 1300 Watt|
|GPU||MSI RX 6700 XT Gaming X|
|Sound||SoundblasterX AE-5 Plus|
|Keyboard||Sharkoon PureWriter RBG (Red Button) @1000 Hz Polling Rate|
|Mouse||Sharkoon Light² 100 @1000 Hz Polling Rate|
|Metrology||NVIDIA LDAT hardware with Logitech G203 Prodigy @1000 Hz polling rate|
|Monitor 1||MSI Oculux NXG252R 240 Hz via DP (NVIDIA G-SYNC)|
|Monitor 2||AOC G2778VQ 75 Hz via DP (AMD FreeSync)|
Special attention should be paid to the measurement technology. I use NVIDIA LDAT hardware, for this the Logitech G203 Prodigy is directly coupled with the LDAT measurement technology. That’s why it’s important to actually read all of my articles regarding system latency. This is not the Bild newspaper: read the headline and form an opinion! So, here again is Igor’s article on LDAT, click here. LDAT measures the complete system latency – from the mouse click to the pixel on the monitor! LDAT doesn’t care if there is an NVIDIA or AMD GPU in the slot. It could also be an FPS generating spoon. LDAT measures latency independently of the graphics card name. It’s as simple as that!
So I always use the same LDAT Logitech mouse for all measurements! The Sharkoon Light² 100 is for everyday use. The Sharkoon Light² is unsuitable for the measurements because it is not coupled with LDAT. Why am I riding the mouse so much? That was one of the criticisms. What is the essence? Using the best mouse for measurements, or comparing the gimmicks mentioned in the title of the article in terms of system latency? Auxiliary target: It wasn’t about the mouse! Furthermore, the connection of the mouse or that of LDAT was questioned. Okay, that’s valid. Then let’s see what influence the USB port has on the measurements. Next page please!