diff --git a/ggml/src/ggml-quants.c b/ggml/src/ggml-quants.c
index 684e6c788..52468c87e 100644
--- a/ggml/src/ggml-quants.c
+++ b/ggml/src/ggml-quants.c
@@ -149,6 +149,28 @@ static inline __m128i packNibbles( __m256i bytes )
 #endif
 }
 #elif defined(__AVX__)
+static inline __m128i packNibbles( __m128i bytes1, __m128i bytes2 )
+{
+    // Move bits within 16-bit lanes from 0000_abcd_0000_efgh into 0000_0000_abcd_efgh
+    const __m128i lowByte = _mm_set1_epi16( 0xFF );
+    __m128i high = _mm_andnot_si128( lowByte, bytes1 );
+    __m128i low = _mm_and_si128( lowByte, bytes1 );
+    high = _mm_srli_epi16( high, 4 );
+    bytes1 = _mm_or_si128( low, high );
+    high = _mm_andnot_si128( lowByte, bytes2 );
+    low = _mm_and_si128( lowByte, bytes2 );
+    high = _mm_srli_epi16( high, 4 );
+    bytes2 = _mm_or_si128( low, high );
+
+    return _mm_packus_epi16( bytes1, bytes2);
+}
+
+static inline __m128i mul_add_epi8_sse(const __m128i x, const __m128i y) {
+    const __m128i ax = _mm_sign_epi8(x, x);
+    const __m128i sy = _mm_sign_epi8(y, x);
+    return _mm_maddubs_epi16(ax, sy);
+}
+
 // spread 32 bits to 32 bytes { 0x00, 0xFF }
 static inline __m256i bytes_from_bits_32(const uint8_t * x) {
     uint32_t x32;
@@ -216,26 +238,23 @@ static inline __m256 mul_sum_i8_pairs_float(const __m256i x, const __m256i y) {
     return sum_i16_pairs_float(doth, dotl);
 }
 
-static inline __m128i packNibbles( __m128i bytes1, __m128i bytes2 )
-{
-    // Move bits within 16-bit lanes from 0000_abcd_0000_efgh into 0000_0000_abcd_efgh
-    const __m128i lowByte = _mm_set1_epi16( 0xFF );
-    __m128i high = _mm_andnot_si128( lowByte, bytes1 );
-    __m128i low = _mm_and_si128( lowByte, bytes1 );
-    high = _mm_srli_epi16( high, 4 );
-    bytes1 = _mm_or_si128( low, high );
-    high = _mm_andnot_si128( lowByte, bytes2 );
-    low = _mm_and_si128( lowByte, bytes2 );
-    high = _mm_srli_epi16( high, 4 );
-    bytes2 = _mm_or_si128( low, high );
-
-    return _mm_packus_epi16( bytes1, bytes2);
+// larger version of mul_sum_i8_pairs_float where x and y are each represented by four 128-bit vectors
+static inline __m256 mul_sum_i8_quad_float(const __m128i x_1_0, const __m128i x_1_1, const __m128i x_2_0, const __m128i x_2_1,
+                                           const __m128i y_1_0, const __m128i y_1_1, const __m128i y_2_0, const __m128i y_2_1) {
+    const __m128i p16_1_0 = mul_add_epi8_sse(x_1_0, y_1_0);
+    const __m128i p16_1_1 = mul_add_epi8_sse(x_1_1, y_1_1);
+    const __m128i p16_2_0 = mul_add_epi8_sse(x_2_0, y_2_0);
+    const __m128i p16_2_1 = mul_add_epi8_sse(x_2_1, y_2_1);
+    __m128i p_1 = _mm_add_epi16(p16_1_0, p16_1_1);
+    __m128i p_2 = _mm_add_epi16(p16_2_0, p16_2_1);
+    return sum_i16_pairs_float(p_2, p_1);
 }
 
-static inline __m128i mul_add_epi8_sse(const __m128i x, const __m128i y) {
-    const __m128i ax = _mm_sign_epi8(x, x);
-    const __m128i sy = _mm_sign_epi8(y, x);
-    return _mm_maddubs_epi16(ax, sy);
+// fp16 delta calculation intended for mul_sum_i8_quad_float
+static inline __m256 quad_fp16_delta_float(const float x0, const float y0, const float x1, const float y1) {
+    // GGML_FP16_TO_FP32 is faster than Intel F16C
+    return _mm256_set_m128(_mm_set1_ps(GGML_FP16_TO_FP32(x1) * GGML_FP16_TO_FP32(y1)),
+                           _mm_set1_ps(GGML_FP16_TO_FP32(x0) * GGML_FP16_TO_FP32(y0)));
 }
 #endif
 #elif defined(__SSSE3__)
@@ -4227,18 +4246,9 @@ void ggml_vec_dot_q4_0_q8_0(int n, float * restrict s, size_t bs, const void * r
         const __m128i q4b_2_0 = _mm_sub_epi8(_mm_and_si128(_mm_set1_epi8(15), q4bits_2), _mm_set1_epi8(8));
         const __m128i q4b_2_1 = _mm_sub_epi8(_mm_and_si128(_mm_set1_epi8(15), _mm_srli_epi16(q4bits_2, 4)), _mm_set1_epi8(8));
 
-        const __m128i p16_1_0 = mul_add_epi8_sse(q4b_1_0, q8b_1_0);
-        const __m128i p16_1_1 = mul_add_epi8_sse(q4b_1_1, q8b_1_1);
-        const __m128i p16_2_0 = mul_add_epi8_sse(q4b_2_0, q8b_2_0);
-        const __m128i p16_2_1 = mul_add_epi8_sse(q4b_2_1, q8b_2_1);
-        __m128i p_1 = _mm_add_epi16(p16_1_0, p16_1_1);
-        p_1 = _mm_madd_epi16(p_1, _mm_set1_epi16(1));
-        __m128i p_2 = _mm_add_epi16(p16_2_0, p16_2_1);
-        p_2 = _mm_madd_epi16(p_2, _mm_set1_epi16(1));
-
-        const __m256 deltas = _mm256_set_m128(_mm_set1_ps(GGML_FP16_TO_FP32(x[ib + 1].d) * GGML_FP16_TO_FP32(y[ib + 1].d)),
-                              _mm_set1_ps(GGML_FP16_TO_FP32(x[ib].d) * GGML_FP16_TO_FP32(y[ib].d)));
-        accum = _mm256_add_ps(_mm256_mul_ps(deltas, _mm256_cvtepi32_ps(MM256_SET_M128I(p_2, p_1))), accum);
+        const __m256 p = mul_sum_i8_quad_float(q4b_1_0, q4b_1_1, q4b_2_0, q4b_2_1, q8b_1_0, q8b_1_1, q8b_2_0, q8b_2_1);
+        const __m256 deltas = quad_fp16_delta_float(x[ib].d, y[ib].d, x[ib + 1].d, y[ib + 1].d);
+        accum = _mm256_add_ps(_mm256_mul_ps(deltas, p), accum);
     }
 
     sumf = hsum_float_8(accum);