diff --git a/include/cpuinfo.h b/include/cpuinfo.h
index 1972309..a7f17c2 100644
--- a/include/cpuinfo.h
+++ b/include/cpuinfo.h
@@ -188,6 +188,8 @@
 	 * Processors are variants of AMD cores.
 	 */
 	cpuinfo_vendor_hygon    = 16,
+	/** Ampere Computing LLC. Vendor of ARM64 processor microarchitectures. */
+	cpuinfo_vendor_ampere   = 17,
 
 	/* Active vendors of embedded CPUs */
 
diff --git a/src/arm/windows/init-by-logical-sys-info.c b/src/arm/windows/init-by-logical-sys-info.c
index f088011..fe2611c 100644
--- a/src/arm/windows/init-by-logical-sys-info.c
+++ b/src/arm/windows/init-by-logical-sys-info.c
@@ -689,7 +689,7 @@
 		current_cache->flags = CPUINFO_CACHE_UNIFIED;
 	}
 
-	for (uint32_t i = 0; i <= info->Cache.GroupCount; i++) {
+	for (uint32_t i = 0; i < info->Cache.GroupCount; i++) {
 	/* Zero GroupCount is valid, GroupMask still can store bits set. */
 		const uint32_t group_id = info->Cache.GroupMasks[i].Group;
 		/* Bitmask representing processors in this group belonging to this package */
diff --git a/src/arm/windows/init.c b/src/arm/windows/init.c
index 8effc15..2d25e95 100644
--- a/src/arm/windows/init.c
+++ b/src/arm/windows/init.c
@@ -30,6 +30,10 @@
 	{
 		"Qualcomm",
 		cpuinfo_vendor_qualcomm
+	},
+	{
+		"Ampere(R)",
+		cpuinfo_vendor_ampere
 	}
 };
 
@@ -64,6 +68,32 @@
 				3150000000
 			}
 		}
+	},
+	/* Microsoft Windows Dev Kit 2023 */
+	{
+		"Snapdragon (TM) 8cx Gen 3 @ 3.0 GHz",
+		woa_chip_name_microsoft_sq_3,
+		{
+			{
+				cpuinfo_uarch_cortex_a78,
+				2420000000,
+			},
+			{
+				cpuinfo_uarch_cortex_x1,
+				3000000000
+			}
+		}
+	},
+	/* Ampere Altra */
+	{
+		"Ampere(R) Altra(R) Processor",
+		woa_chip_name_ampere_altra,
+		{
+			{
+				cpuinfo_uarch_neoverse_n1,
+				3000000000
+			}
+		}
 	}
 };
 
diff --git a/src/arm/windows/windows-arm-init.h b/src/arm/windows/windows-arm-init.h
index 76cc51e..fcd0f38 100644
--- a/src/arm/windows/windows-arm-init.h
+++ b/src/arm/windows/windows-arm-init.h
@@ -4,7 +4,9 @@
 enum woa_chip_name {
 	woa_chip_name_microsoft_sq_1 = 0,
 	woa_chip_name_microsoft_sq_2 = 1,
-	woa_chip_name_unknown = 2,
+	woa_chip_name_microsoft_sq_3 = 2,
+	woa_chip_name_ampere_altra = 3,
+	woa_chip_name_unknown = 4,
 	woa_chip_name_last = woa_chip_name_unknown
 };