diff --git a/src/crypto/CryptoNight.cpp b/src/crypto/CryptoNight.cpp
index dd24f90d..03a43564 100644
--- a/src/crypto/CryptoNight.cpp
+++ b/src/crypto/CryptoNight.cpp
@@ -546,6 +546,11 @@ bool CryptoNight::selfTest(int algo)
         cryptonight_hash_ctx[0](asmOptimization, PowVariant::POW_V2, test_input, 76, output, scratchPads);
         resultUltraLite = resultUltraLite && memcmp(output,  test_output_turtle, 32) == 0;
 
+        #if MAX_NUM_HASH_BLOCKS > 1
+        cryptonight_hash_ctx[1](asmOptimization, PowVariant::POW_V2, test_input, 76, output, scratchPads);
+        resultUltraLite = resultUltraLite && memcmp(output,  test_output_turtle, 64) == 0;
+        #endif
+
     } else {
         // cn v0 aka orignal
 
@@ -646,6 +651,11 @@ bool CryptoNight::selfTest(int algo)
 
         cryptonight_hash_ctx[0](asmOptimization, PowVariant::POW_FAST_2, test_input, 76, output, scratchPads);
         result = result && memcmp(output, test_output_xtl_v9, 32) == 0;
+
+        #if MAX_NUM_HASH_BLOCKS > 1
+        cryptonight_hash_ctx[1](asmOptimization, PowVariant::POW_FAST_2, test_input, 76, output, scratchPads);
+        result = result && memcmp(output, test_output_xtl_v9, 64) == 0;
+        #endif
     }
 
     for (size_t i = 0; i < MAX_NUM_HASH_BLOCKS; ++i) {
diff --git a/src/crypto/CryptoNight_test.h b/src/crypto/CryptoNight_test.h
index b9a940d7..64f125bd 100644
--- a/src/crypto/CryptoNight_test.h
+++ b/src/crypto/CryptoNight_test.h
@@ -123,9 +123,11 @@ const static uint8_t test_output_xfh[32] = {
 };
 
 // CN XTL V9
-const static uint8_t test_output_xtl_v9[32] = {
+const static uint8_t test_output_xtl_v9[64] = {
     0x5D, 0x4F, 0xBC, 0x35, 0x60, 0x97, 0xEA, 0x64, 0x40, 0xB0, 0x88, 0x8E, 0xDE, 0xB6, 0x35, 0xDD,
-    0xC8, 0x4A, 0x0E, 0x39, 0x7C, 0x86, 0x84, 0x56, 0x89, 0x5C, 0x3F, 0x29, 0xBE, 0x73, 0x12, 0xA7
+    0xC8, 0x4A, 0x0E, 0x39, 0x7C, 0x86, 0x84, 0x56, 0x89, 0x5C, 0x3F, 0x29, 0xBE, 0x73, 0x12, 0xA7,
+    0x02, 0xE6, 0x1D, 0x2B, 0xBC, 0x84, 0xB6, 0x71, 0x96, 0x71, 0xD5, 0x0C, 0xAC, 0x76, 0x0E, 0x6B,
+    0xF1, 0xF0, 0x55, 0x34, 0x15, 0x29, 0x93, 0x04, 0x2D, 0xED, 0xD2, 0x33, 0x50, 0x6E, 0xBE, 0x25
 };
 
 // CN-LITE
@@ -213,9 +215,11 @@ const static uint8_t test_output_heavy_tube[96] = {
 };
 
 // CN-Ultralite/Turtle
-const static uint8_t test_output_turtle[32] = {
+const static uint8_t test_output_turtle[64] = {
 	0x08, 0xF4, 0x21, 0xD7, 0x83, 0x31, 0x17, 0x30, 0x0E, 0xDA, 0x66, 0xE9, 0x8F, 0x4A, 0x25, 0x69,
-	0x09, 0x3D, 0xF3, 0x00, 0x50, 0x01, 0x73, 0x94, 0x4E, 0xFC, 0x40, 0x1E, 0x9A, 0x4A, 0x17, 0xAF
+	0x09, 0x3D, 0xF3, 0x00, 0x50, 0x01, 0x73, 0x94, 0x4E, 0xFC, 0x40, 0x1E, 0x9A, 0x4A, 0x17, 0xAF,
+	0xB2, 0x17, 0x2E, 0xC9, 0x46, 0x6E, 0x1A, 0xEE, 0x70, 0xEC, 0x85, 0x72, 0xA1, 0x4C, 0x23, 0x3E,
+	0xE3, 0x54, 0x58, 0x2B, 0xCB, 0x93, 0xF8, 0x69, 0xD4, 0x29, 0x74, 0x4D, 0xE5, 0x72, 0x6A, 0x26
 };
 
 #endif /* __CRYPTONIGHT_TEST_H__ */
diff --git a/src/crypto/asm/cnv2_double_main_loop_sandybridge.inc.in b/src/crypto/asm/cnv2_double_main_loop_sandybridge.inc.in
index bdf86ea7..d3a328cf 100644
--- a/src/crypto/asm/cnv2_double_main_loop_sandybridge.inc.in
+++ b/src/crypto/asm/cnv2_double_main_loop_sandybridge.inc.in
@@ -18,7 +18,7 @@
 	mov	r10, QWORD PTR [rcx+32]
 	mov	r8, rcx
 	xor	r10, QWORD PTR [rcx]
-	mov	r14d, 524288
+	mov	r14d, ${ITERATIONS}
 	mov	r11, QWORD PTR [rcx+40]
 	xor	r11, QWORD PTR [rcx+8]
 	mov	rsi, QWORD PTR [rdx+224]
@@ -41,7 +41,7 @@
 	movaps	XMMWORD PTR [rsp+16], xmm15
 	mov	rdx, r10
 	movq	xmm4, QWORD PTR [r8+96]
-	and	edx, 2097136
+	and	edx, ${MASK}
 	mov	rax, QWORD PTR [rcx+48]
 	xorps	xmm13, xmm13
 	xor	rax, QWORD PTR [rcx+16]
@@ -83,7 +83,7 @@
 	mov	rcx, rdi
 	mov	QWORD PTR [rsp+264], r11
 	movq	xmm8, rax
-	and	ecx, 2097136
+	and	ecx, ${MASK}
 	punpcklqdq xmm8, xmm0
 	movq	xmm0, QWORD PTR [r9+96]
 	punpcklqdq xmm4, xmm0
@@ -124,7 +124,7 @@ cnv2_double_main_loop_${ALGO}_sandybridge:
 
 	movq	r11, xmm9
 	mov	edx, r11d
-	and	edx, 2097136
+	and	edx, ${MASK}
 	movdqa	xmm0, xmm9
 	pxor	xmm0, xmm7
 	movdqu	XMMWORD PTR [r9], xmm0
@@ -155,7 +155,7 @@ cnv2_double_main_loop_${ALGO}_sandybridge:
 	movdqu	XMMWORD PTR [rax+rsi], xmm0
 
 	movq	rcx, xmm10
-	and	ecx, 2097136
+	and	ecx, ${MASK}
 
 	movdqa	xmm0, xmm10
 	pxor	xmm0, xmm6
@@ -203,7 +203,7 @@ cnv2_double_main_loop_${ALGO}_sandybridge:
 	mov	QWORD PTR [rbx+8], rdx
 	xor	rdx, r9
 	mov	QWORD PTR [rsp+256], r11
-	and	r11d, 2097136
+	and	r11d, ${MASK}
 	mov	QWORD PTR [rsp+264], rdx
 	mov	QWORD PTR [rsp+8], r11
 	lea	r15, QWORD PTR [r11+r13]
@@ -317,7 +317,7 @@ sqrt_fix_2_ret_${ALGO}_sandybridge:
 	mov	QWORD PTR [r13], rdi
 	xor	rdi, r10
 	mov	ecx, edi
-	and	ecx, 2097136
+	and	ecx, ${MASK}
 	lea	r8, QWORD PTR [rcx+rsi]
 
 	mov rdx, QWORD PTR [r13+8]
diff --git a/src/net/Job.cpp b/src/net/Job.cpp
index 612c37e7..428bc882 100644
--- a/src/net/Job.cpp
+++ b/src/net/Job.cpp
@@ -150,6 +150,10 @@ PowVariant Job::powVariant() const
         } else {
             return PowVariant::POW_V0;
         }
+    } else if (m_powVariant == PowVariant::POW_XTL) {
+        if (m_blob[0] >= 9) {
+            return PowVariant::POW_FAST_2;
+        }
     } else if (m_powVariant == PowVariant::POW_MSR) {
         if (m_blob[0] >= 8) {
             return PowVariant::POW_FAST_2;