[GPU OC] Max freq: 1305 MHz, tested with FP32 compute shaders; Disable GPU overvolting

README.md

@@ -58,10 +58,9 @@ I'd appreciate if someone is willing to contribute. But if you are releasing som
       - This is where floating point performance maxed out.
       - ≥ 2193 MHz will _ENABLE OVERVOLTING_.
 
-    - GPU: 1497 MHz @ 1170 mV (overvolting from 1050 mV)
-      - Not tested. Not sure if it has any benefit over 1267 MHz. GPU (OpenGL) benchmark is required.
-      - ≥ 1344 MHz _cannot be set without official chargers_.
-      - ≥ 1420 MHz will _ENABLE OVERVOLTING_.
+    - GPU: 1305 MHz (no overvolting, less than official threshold 1050 mV)
+      - Tested with deko3d compute shaders converted from [Maxwell SASS assembly](https://gist.github.com/KazushiMe/82b6bd89621f451b51c9b1ccd2202b97). Single-precision floating point (FP32 FFMA) performance maxes out at 1305 MHz.
+      - 1305 MHz CANNOT be set without charger connected.
 
     - DRAM: Overvolting
       - [Use this to set DRAM bus voltage](https://gist.github.com/KazushiMe/6bb0fcbefe0e03b1274079522516d56d).

Source/Atmosphere/stratosphere/loader/source/ldr_oc_patch.hpp

@@ -94,12 +94,12 @@ namespace pcv {
     constexpr u32 NewMaxCpuClock = 2397000;
 
     /* GPU */
-    constexpr u32 GpuVoltageLimitOffsets[] = {
-        // 0xE3044,
-        // 0xF1E94,
-        0xF1EE4,
-    };
-    constexpr u32 NewGpuVoltageLimit = 1170; // default max 1050mV
+    // constexpr u32 GpuVoltageLimitOffsets[] = {
+    //     // 0xE3044,
+    //     // 0xF1E94,
+    //     0xF1EE4,
+    // };
+    // constexpr u32 NewGpuVoltageLimit = 1170; // default max 1050mV
 
     constexpr u32 GpuTablesFreeSpace[] = {
         // 0xE3410,
@@ -120,13 +120,7 @@ namespace pcv {
      // { 1152000, {}, { 1204812,  -9908, -830,    0,   1469, 110 } },
      // { 1228800, {}, { 1277303, -11675, -859,    0,   3722, 313 } },
      // { 1267200, {}, { 1335531, -12567, -867,    0,   3681, 559 } },
-        { 1305600, {}, {  955000 } },
-        { 1344000, {}, {  990000 } },
-        { 1382400, {}, { 1030000 } },
-        { 1420800, {}, { 1075000 } },
-        { 1459200, {}, { 1120000 } },
-        { 1497600, {}, { 1170000 } },
-     // { 1536000, {}, { 1250000 } },
+        { 1305600, {}, { 1374130, -13725, -859,    0,   4442, 576 } },
     };
     static_assert(sizeof(NewGpuTables) <= sizeof(gpu_cvb_pll_table_t)*15);
 

Source/Atmosphere/stratosphere/loader/source/ldr_patcher.cpp

@@ -176,9 +176,6 @@ namespace ams::ldr {
                         std::memcpy(reinterpret_cast<void *>(mapped_nso + pcv::CpuVoltageOldTableCoeff[i][j]), &pcv::NewCpuVoltageScaled, sizeof(pcv::NewCpuVoltageScaled));
                     }
 
-                    /* Patch max GPU voltage on Mariko */
-                    std::memcpy(reinterpret_cast<void *>(mapped_nso + pcv::GpuVoltageLimitOffsets[i]), &pcv::NewGpuVoltageLimit, sizeof(pcv::NewGpuVoltageLimit));
-
                     for (u32 j = 0; j < sizeof(pcv::MtcTable_1600[i])/sizeof(u32); j++) {
                         pcv::MarikoMtcTable* mtc_table_new = reinterpret_cast<pcv::MarikoMtcTable *>(mapped_nso + pcv::MtcTable_1600[i][j]);
                         pcv::MarikoMtcTable* mtc_table_old = reinterpret_cast<pcv::MarikoMtcTable *>(mapped_nso + pcv::MtcTable_1600[i][j] - pcv::MtcTableOffset);

Source/sys-clk-OC/README.md

@@ -28,13 +28,7 @@ Switch sysmodule allowing you to set cpu/gpu clocks according to the running app
 
 ### GPU clocks
 
-* 1??? → unknown max for Mariko
-* 1497
-* 1459
-* 1420
-* 1382
-* 1344
-* 1305
+* 1305 → OC max for Mariko
 * 1267 → official max for Mariko
 * 1228
 * 1152
@@ -55,7 +49,7 @@ Switch sysmodule allowing you to set cpu/gpu clocks according to the running app
 
 ### MEM clocks
 
-**Only 1331 and Max could be set in sys-clk-OC.**
+**Only 1600 and Max could be set in sys-clk-OC.**
 
 From Hekate Minerva module [sys_sdrammtc.c](https://github.com/CTCaer/hekate/blob/197ed8c319bd4132e4d7571ce037d4a27f806bba/modules/hekate_libsys_minerva/sys_sdrammtc.c#L67)
 

Source/sys-clk-OC/common/src/clock_table.c

@@ -70,11 +70,5 @@ uint32_t sysclk_g_freq_table_gpu_hz[] = {
     1228800000,
     1267200000,
     1305600000,
-    1344000000,
-    1382400000,
-    1420800000,
-    1459200000,
-    1497600000,
-    // 1536000000,
     0,
 };